diff --git a/booleans-and-conditionals/exercises/part-1.js b/booleans-and-conditionals/exercises/part-1.js
index b829140a07..f4633a415b 100644
--- a/booleans-and-conditionals/exercises/part-1.js
+++ b/booleans-and-conditionals/exercises/part-1.js
@@ -1,11 +1,16 @@
 // Declare and initialize the variables for exercise 1 here:
-
+let engineIndicatorLight = "red blinking";
+let spaceSuitsOn = true;
+let shuttleCabinReady = true;
+let crewStatus = spaceSuitsOn && shuttleCabinReady;
+let computerStatusCode = 200;
+let shuttleSpeed = 15000;
 // BEFORE running the code, predict what will be printed to the console by the following statements:
 
 if (engineIndicatorLight === "green") {
-   console.log("engines have started");
+  console.log("engines have started");
 } else if (engineIndicatorLight === "green blinking") {
-   console.log("engines are preparing to start");
+  console.log("engines are preparing to start");
 } else {
-   console.log("engines are off");
+  console.log("engines are off");
 }
diff --git a/booleans-and-conditionals/exercises/part-2.js b/booleans-and-conditionals/exercises/part-2.js
index ff11fbab8a..ed3399c355 100644
--- a/booleans-and-conditionals/exercises/part-2.js
+++ b/booleans-and-conditionals/exercises/part-2.js
@@ -8,14 +8,29 @@ let shuttleSpeed = 15000;
 // 3) Write conditional expressions to satisfy the following safety rules:
 
 // a) If crewStatus is true, print "Crew Ready" else print "Crew Not Ready".
-
+if (crewStatus) {
+  console.log("Crew Ready");
+} else {
+  console.log("Crew Not Ready");
+}
 
 // b) If computerStatusCode is 200, print "Please stand by. Computer is rebooting." Else if computerStatusCode is 400, print "Success! Computer online." Else print "ALERT: Computer offline!"
-
+if (computerStatusCode === 200) {
+  console.log("Please stand by. Computer is rebooting.");
+} else if (computerStatusCode === 400) {
+  console.log("Success! Computer online.");
+} else {
+  console.log("ALERT: Computer offline!");
+}
 
 // c) If shuttleSpeed is > 17,500, print "ALERT: Escape velocity reached!" Else if shuttleSpeed is < 8000, print "ALERT: Cannot maintain orbit!" Else print "Stable speed".
-
-
+if (shuttleSpeed > 17500) {
+  console.log("ALERT: Escape velocity reached!");
+} else if (shuttleSpeed < 8000) {
+  console.log("ALERT: Cannot maintain orbit!");
+} else {
+  console.log("Stable speed.");
+}
 // 4) PREDICT: Do the code blocks shown in the 'predict.txt' file produce the same result?
 
-console.log(/* "Yes" or "No" */);
+console.log("Yes");
diff --git a/booleans-and-conditionals/exercises/part-3.js b/booleans-and-conditionals/exercises/part-3.js
index 9ed686d097..d361090234 100644
--- a/booleans-and-conditionals/exercises/part-3.js
+++ b/booleans-and-conditionals/exercises/part-3.js
@@ -1,7 +1,25 @@
-let engineIndicatorLight = 'red blinking';
+let engineIndicatorLight = "red blinking";
 let fuelLevel = 21000;
 let engineTemperature = 1200;
 
+if (
+  fuelLevel < 1000 ||
+  engineTemperature > 3500 ||
+  engineIndicatorLight === "red blinking"
+) {
+  console.log("ENGINE FAILURE IMMINENT!");
+} else if (fuelLevel <= 5000 || engineTemperature > 2500) {
+  console.log("Check fuel level. Engines running hot.");
+} else if (fuelLevel > 20000 && engineTemperature <= 2500) {
+  console.log("Full tank. Engines good.");
+} else if (fuelLevel > 10000 && engineTemperature <= 2500) {
+  console.log("Fuel level above 50%. Engines good.");
+} else if (fuelLevel > 5000 && engineTemperature <= 2500) {
+  console.log("Fuel level above 25%. Engines good.");
+} else {
+  console.log("Fuel and engine status pending...");
+} 
+
 /* 5) Implement the following checks using if/else if/else statements:
 
 a) If fuelLevel is above 20000 AND engineTemperature is at or below 2500, print "Full tank. Engines good."
@@ -22,3 +40,9 @@ f) Otherwise, print "Fuel and engine status pending..." */
 
 /* 6) b) Code the following if/else check:
 If fuelLevel is above 20000 AND engineIndicatorLight is NOT red blinking OR commandOverride is true print "Cleared to launch!" Else print "Launch scrubbed!" */
+let commandOverride = true;
+if ((fuelLevel > 20000 && engineIndicatorLight !== 'red blinking') || commandOverride) {
+    console.log("Cleared to launch");
+} else {
+    console.log("Launch scrubbed!");
+}
\ No newline at end of file
diff --git a/booleans-and-conditionals/studio/data-variables-conditionals.js b/booleans-and-conditionals/studio/data-variables-conditionals.js
index 6a15e146f4..8adaf8214e 100644
--- a/booleans-and-conditionals/studio/data-variables-conditionals.js
+++ b/booleans-and-conditionals/studio/data-variables-conditionals.js
@@ -1,15 +1,68 @@
 // Initialize Variables below
+let date = "Monday 2019-03-18";
+let time = "10:05:34 AM";
+let astronautCount = 7;
+let astronautStatus = "ready";
+let averageAstronautMassKg = 80.7;
+let crewMassKg = astronautCount * averageAstronautMassKg;
+let fuelMassKg = 760000;
+let shuttleMassKg = 74842.31;
+let totalMassKg = crewMassKg + fuelMassKg + shuttleMassKg;
+let maximumMassLimit = 850000;
+let fuelTempCelsius = -225;
+let minimumFuelTemp = -300;
+let maximumFuelTemp = -150;
+let fuelLevel = "100%";
+let weatherStatus = "clear";
+let prepareForLiftOff = true;
 
 // add logic below to verify total number of astronauts for shuttle launch does not exceed 7
-
+let isClearedForLiftOff = true;
+if (astronautCount > 7) {
+  isClearedForLiftOff = false;
+  console.log("Astronaut count exceeds limit.");
+}
 // add logic below to verify all astronauts are ready
-
+if (astronautStatus !== "ready") {
+  isClearedForLiftOff = false;
+  console.log("Astronaut status not ready");
+}
 // add logic below to verify the total mass does not exceed the maximum limit of 850000
+if (totalMassKg >= maximumMassLimit) {
+  isClearedForLiftOff = false;
+  console.log("Total mass exceeds maximum mass limit.");
+}
 
 // add logic below to verify the fuel temperature is within the appropriate range of -150 and -300
+if (fuelTempCelsius < minimumFuelTemp || fuelTempCelsius > maximumFuelTemp) {
+  isClearedForLiftOff = false;
+  console.log("Fuel temperature out of acceptable range.");
+}
 
 // add logic below to verify the fuel level is at 100%
+if (fuelLevel !== "100%") {
+  isClearedForLiftOff = false;
+  console.log("Fuel level not at 100%.");
+}
 
 // add logic below to verify the weather status is clear
-
+if (weatherStatus !== "clear") {
+  isClearedForLiftOff = false;
+  console.log("Weather status not clear.");
+}
 // Verify shuttle launch can proceed based on above conditions
+if (isClearedForLiftOff && prepareForLiftOff) {
+  console.log("All systems are a go! Initiating space shuttle launch sequence.");
+  console.log("Date:", date);
+  console.log("Time:", time);
+  console.log("Astronaut Count:", astronautCount);
+  console.log("Crew Mass (kg):", crewMassKg);
+  console.log("Fuel mass (kg):", fuelMassKg);
+  console.log("Shuttle Mass (kg):", shuttleMassKg);
+  console.log("Total Mass (kg):", totalMassKg);
+  console.log("Fuel Temperatture (Celsius):", fuelTempCelsius);
+  console.log("Weather Status:", weatherStatus);
+  console.log("Have a safe trip astronauts!");
+} else {
+  console.log("Launch operations aborted.");
+}
diff --git a/data-and-variables/exercises/data-and-variables-exercises.js b/data-and-variables/exercises/data-and-variables-exercises.js
index 6433bcd641..af28bab328 100644
--- a/data-and-variables/exercises/data-and-variables-exercises.js
+++ b/data-and-variables/exercises/data-and-variables-exercises.js
@@ -1,11 +1,26 @@
 // Declare and assign the variables below
-
+let shuttleName = "Determination";
+let shuttleSpeedMph = 17500;
+let distanceToMarsKm = 225000000;
+let distanceToMoonKm = 38400;
+const milesPerKm = 0.621;
 // Use console.log to print the 'typeof' each variable. Print one item per line.
-
+console.log(typeof "Determination");
+console.log(typeof 17500);
+console.log(typeof 225000000);
+console.log(typeof 38400);
+console.log(typeof 0.621);
 // Calculate a space mission below
-
+let milesToMars = distanceToMarsKm * milesPerKm;
+let hoursToMars = milesToMars / shuttleSpeedMph;
+let daysToMars = hoursToMars / 24;
 // Print the results of the space mission calculations below
-
+console.log(shuttleName + " will take " + daysToMars + " days to reach Mars.");
 // Calculate a trip to the moon below
-
-// Print the results of the trip to the moon below
\ No newline at end of file
+let milesToMoon = distanceToMoonKm * milesPerKm;
+let hoursToMoon = milesToMoon / shuttleSpeedMph;
+let daysToMoon = hoursToMoon / 24;
+// Print the results of the trip to the moon below
+console.log(
+  shuttleName + " will take " + daysToMoon + " days to reach the Moon."
+);
diff --git a/errors-and-debugging/chapter-examples/SyntaxErrors.js b/errors-and-debugging/chapter-examples/SyntaxErrors.js
index 5597f22de5..8edaeaf279 100644
--- a/errors-and-debugging/chapter-examples/SyntaxErrors.js
+++ b/errors-and-debugging/chapter-examples/SyntaxErrors.js
@@ -1,2 +1,2 @@
 let day = Wednesday;
-console.log(day;
\ No newline at end of file
+console.log(day);
\ No newline at end of file
diff --git a/errors-and-debugging/exercises/Debugging1stSyntaxError.js b/errors-and-debugging/exercises/Debugging1stSyntaxError.js
index 365af5a964..442bc86a6b 100644
--- a/errors-and-debugging/exercises/Debugging1stSyntaxError.js
+++ b/errors-and-debugging/exercises/Debugging1stSyntaxError.js
@@ -4,10 +4,10 @@
 let launchReady = false;
 let fuelLevel = 17000;
 
-if (fuelLevel >= 20000 {
-   console.log('Fuel level cleared.');
-   launchReady = true;
+if (fuelLevel >= 20000) {
+  console.log("Fuel level cleared.");
+  launchReady = true;
 } else {
-   console.log('WARNING: Insufficient fuel!');
-   launchReady = false;
-}
\ No newline at end of file
+  console.log("WARNING: Insufficient fuel!");
+  launchReady = false;
+}
diff --git a/errors-and-debugging/exercises/DebuggingLogicErrors5.js b/errors-and-debugging/exercises/DebuggingLogicErrors5.js
index 7eb908e769..d37adac256 100644
--- a/errors-and-debugging/exercises/DebuggingLogicErrors5.js
+++ b/errors-and-debugging/exercises/DebuggingLogicErrors5.js
@@ -1,28 +1,39 @@
 // The value of launchReady assigned in the first if/else block gets changed in the second if/else block. Dangerous waters...
-// Since the issue is with launchReady, ONE way to fix the logic error is to use a different variable to store the fuel check result. 
+// Since the issue is with launchReady, ONE way to fix the logic error is to use a different variable to store the fuel check result.
 // Refactor the code to do this. Verify that your change works by updating the console.log statements.
 
 let launchReady = false;
+crewReady = false;
 let fuelLevel = 17000;
 let crewStatus = true;
-let computerStatus = 'green';
+let computerStatus = "green";
 
 if (fuelLevel >= 20000) {
-   console.log('Fuel level cleared.');
-   launchReady = true;
+  console.log("Fuel level cleared.");
+  launchReady = true;
 } else {
-   console.log('WARNING: Insufficient fuel!');
-   launchReady = false;
+  console.log("WARNING: Insufficient fuel!");
+  launchReady = false;
 }
 
 console.log("launchReady = ", launchReady);
 
-if (crewStatus && computerStatus === 'green'){
-   console.log('Crew & computer cleared.');
-   launchReady = true;
+if (crewStatus && computerStatus === "green") {
+  console.log("Crew & computer cleared.");
+  crewReady = true;
 } else {
-   console.log('WARNING: Crew or computer not ready!');
-   launchReady = false;
+  console.log("WARNING: Crew or computer not ready!");
+  crewReady = false;
 }
 
-console.log("launchReady = ", launchReady);
\ No newline at end of file
+console.log("crewReady = ", crewReady);
+// final  if/else countdown
+if (launchReady && crewReady) {
+  console.log("All systems go. Countdown to liftoff: ");
+  for (let i = 3; i > 0; i--) {
+    console.log(i);
+  }
+  console.log("Liftoff!");
+} else {
+  console.log("Launch scrubbed. ");
+}
diff --git a/errors-and-debugging/exercises/DebuggingRuntimeErrors1.js b/errors-and-debugging/exercises/DebuggingRuntimeErrors1.js
index e66e494a30..7bbf7ebb82 100644
--- a/errors-and-debugging/exercises/DebuggingRuntimeErrors1.js
+++ b/errors-and-debugging/exercises/DebuggingRuntimeErrors1.js
@@ -4,7 +4,7 @@
 let launchReady = false;
 let fuelLevel = 17000;
 
-if (fuellevel >= 20000) {
+if (fuelLevel >= 20000) {
    console.log('Fuel level cleared.');
    launchReady = true;
 } else {
diff --git a/errors-and-debugging/exercises/DebuggingRuntimeErrors2.js b/errors-and-debugging/exercises/DebuggingRuntimeErrors2.js
index a656080d25..703a0d61c4 100644
--- a/errors-and-debugging/exercises/DebuggingRuntimeErrors2.js
+++ b/errors-and-debugging/exercises/DebuggingRuntimeErrors2.js
@@ -14,7 +14,7 @@ if (launchReady) {
    console.log("Fed parrot...");
    console.log("6, 5, 4...");
    console.log("Ignition...");
-   consoul.log("3, 2, 1...");
+   console.log("3, 2, 1...");
    console.log("Liftoff!");
 } else {
    console.log("Launch scrubbed.");
diff --git a/errors-and-debugging/exercises/DebuggingSyntaxErrors2.js b/errors-and-debugging/exercises/DebuggingSyntaxErrors2.js
index b600339254..947f0b33bb 100644
--- a/errors-and-debugging/exercises/DebuggingSyntaxErrors2.js
+++ b/errors-and-debugging/exercises/DebuggingSyntaxErrors2.js
@@ -1,26 +1,26 @@
 //This block of code hides two syntax errors.
 
-// Run the code and find the mistakes. 
-// Only ONE error will be flagged at a time. 
+// Run the code and find the mistakes.
+// Only ONE error will be flagged at a time.
 // Fix that ONE problem, and then re-run the code to check yer work. Avoid trying to fix multiple issues at once.
 
 let launchReady = false;
 let crewStatus = true;
-let computerStatus = 'green';
+let computerStatus = "green";
 
-if (crewStatus &&& computerStatus === 'green'){
-   console.log('Crew & computer cleared.');
-   launchReady = true;
+if (crewStatus && computerStatus === "green") {
+  console.log("Crew & computer cleared.");
+  launchReady = true;
 } else {
-   console.log('WARNING: Crew or computer not ready!');
-   launchReady = false;
+  console.log("WARNING: Crew or computer not ready!");
+  launchReady = false;
 }
 
 if (launchReady) {
-   console.log(("10, 9, 8, 7, 6, 5, 4, 3, 2, 1...");
-   console.log("Fed parrot...");
-   console.log("Ignition...");
-   console.log("Liftoff!");
+  console.log("10, 9, 8, 7, 6, 5, 4, 3, 2, 1...");
+  console.log("Fed parrot...");
+  console.log("Ignition...");
+  console.log("Liftoff!");
 } else {
-   console.log("Launch scrubbed.");
-}
\ No newline at end of file
+  console.log("Launch scrubbed.");
+}
diff --git a/how-to-write-code/assignment0-javascript b/how-to-write-code/assignment0-javascript
new file mode 160000
index 0000000000..e1be55f9af
--- /dev/null
+++ b/how-to-write-code/assignment0-javascript
@@ -0,0 +1 @@
+Subproject commit e1be55f9af96fb792c10fdf77d217f8e6013c138
diff --git a/objects-and-math/exercises/ObjectExercises.js b/objects-and-math/exercises/ObjectExercises.js
index 9a50cbdecc..14e15c17ce 100644
--- a/objects-and-math/exercises/ObjectExercises.js
+++ b/objects-and-math/exercises/ObjectExercises.js
@@ -1,24 +1,79 @@
 let superChimpOne = {
-   name: "Chad",
-   species: "Chimpanzee",
-   mass: 9,
-   age: 6
+  name: "Chad",
+  species: "Chimpanzee",
+  mass: 9,
+  age: 6,
+  astronautID: 1,
+  move: function () {
+    return Math.floor(Math.random() * 11);
+  },
 };
 
 let salamander = {
-   name: "Lacey",
-   species: "Axolotl Salamander",
-   mass: 0.1,
-   age: 5
+  name: "Lacey",
+  species: "Axolotl Salamander",
+  mass: 0.1,
+  age: 5,
+  astronautID: 2,
+  move: function () {
+    return Math.floor(Math.random() * 11);
+  },
+};
+let superChimpTwo = {
+  name: "Brad",
+  species: "Chimpanzee",
+  mass: 11,
+  age: 6,
+  astronautID: 3,
+  move: function () {
+    return Math.floor(Math.random() * 11);
+  },
+};
+let dog = {
+  name: "Leroy",
+  species: "Beagle",
+  mass: 14,
+  age: 5,
+  astronautID: 4,
+  move: function () {
+    return Math.floor(Math.random() * 11);
+  },
+};
+let waterBear = {
+  name: "Almina",
+  species: "Tardigrade",
+  mass: 0.0000000001,
+  age: 1,
+  astronautID: 5,
+  move: function () {
+    return Math.floor(Math.random() * 11);
+  },
 };
-
 
 // After you have created the other object literals, add the astronautID property to each one.
 
 // Add a move method to each animal object
 
 // Create an array to hold the animal objects.
+let crew = [superChimpOne, superChimpTwo, salamander, dog, waterBear];
 
 // Print out the relevant information about each animal.
-
+function crewReports(animal) {
+  return `${animal.name} is a ${animal.species}. They are ${animal.age} years old and ${animal.mass} kilograms. Their ID is ${animal.astronautID}.`;
+}
+crew.forEach((animal) => console.log(crewReports(animal)));
 // Start an animal race!
+function fitnessTest(crew) {
+  let results = crew.map((animal) => {
+    let steps = 0;
+    let turns = 0;
+    while (steps < 20) {
+      steps += animal.move();
+      turns++;
+    }
+    return `${animal.name} took ${turns} turns to take 20 steps.`;
+  });
+  return results;
+}
+let raceResults = fitnessTest(crew);
+raceResults.forEach((result) => console.log(result));
diff --git a/objects-and-math/studio/ObjectsStudio01.js b/objects-and-math/studio/ObjectsStudio01.js
index 98dd0cd471..d40a0df6e2 100644
--- a/objects-and-math/studio/ObjectsStudio01.js
+++ b/objects-and-math/studio/ObjectsStudio01.js
@@ -1,55 +1,102 @@
 // Code your selectRandomEntry function here:
 
 
-// Code your buildCrewArray function here:
-
 
 let idNumbers = [291, 414, 503, 599, 796, 890];
 
+function selectRandomEntry(arrayInput) {
+  return arrayInput[Math.floor(Math.random() * arrayInput.length)];
+}
+const selectedArray = [];
+while (selectedArray.length < 3) {
+  let randomNum = selectRandomEntry(idNumbers);
+  if (!(selectedArray.includes(randomNum))) {
+    selectedArray.push(randomNum);
+    
+  }
+}
+
+// Code your buildCrewArray function here:
+function buildCrewArray(selectedArray, animals) {
+  let crew = [];
+  for (let id of selectedArray) {
+    for (let animal of animals) {
+      if (animal.astronautID === id) {
+        crew.push(animal);
+        break;
+      }
+    }
+  }
+  return crew;
+}
+
+console.log("Selected IDs:", selectedArray);
+
 // Here are the candidates and the 'animals' array:
 let candidateA = {
-  'name':'Gordon Shumway',
-  'species':'alf',
-  'mass':90,
-  'o2Used':function(hrs){return 0.035*hrs},
-  'astronautID':414
+  name: "Gordon Shumway",
+  species: "alf",
+  mass: 90,
+  o2Used: function (hrs) {
+    return 0.035 * hrs;
+  },
+  astronautID: 414,
 };
 let candidateB = {
-  'name':'Lassie',
-  'species':'dog',
-  'mass':19.1,
-  'o2Used':function(hrs){return 0.030*hrs},
-  'astronautID':503
+  name: "Lassie",
+  species: "dog",
+  mass: 19.1,
+  o2Used: function (hrs) {
+    return 0.03 * hrs;
+  },
+  astronautID: 503,
 };
 let candidateC = {
-  'name':'Jonsey',
-  'species':'cat',
-  'mass':3.6,
-  'o2Used':function(hrs){return 0.022*hrs},
-  'astronautID':796
+  name: "Jonsey",
+  species: "cat",
+  mass: 3.6,
+  o2Used: function (hrs) {
+    return 0.022 * hrs;
+  },
+  astronautID: 796,
 };
 let candidateD = {
-  'name':'Paddington',
-  'species':'bear',
-  'mass':31.8,
-  'o2Used':function(hrs){return 0.047*hrs},
-  'astronautID':291
+  name: "Paddington",
+  species: "bear",
+  mass: 31.8,
+  o2Used: function (hrs) {
+    return 0.047 * hrs;
+  },
+  astronautID: 291,
 };
 let candidateE = {
-  'name':'Pete',
-  'species':'tortoise',
-  'mass':417,
-  'o2Used':function(hrs){return 0.010*hrs},
-  'astronautID':599
+  name: "Pete",
+  species: "tortoise",
+  mass: 417,
+  o2Used: function (hrs) {
+    return 0.01 * hrs;
+  },
+  astronautID: 599,
 };
 let candidateF = {
-  'name':'Hugs',
-  'species':'ball python',
-  'mass':2.3,
-  'o2Used':function(hrs){return 0.018*hrs},
-  'astronautID':890
+  name: "Hugs",
+  species: "ball python",
+  mass: 2.3,
+  o2Used: function (hrs) {
+    return 0.018 * hrs;
+  },
+  astronautID: 890,
 };
 
-let animals = [candidateA,candidateB,candidateC,candidateD,candidateE,candidateF];
+let animals = [
+  candidateA,
+  candidateB,
+  candidateC,
+  candidateD,
+  candidateE,
+  candidateF,
+];
 
 // Code your template literal and console.log statements:
+let crew = buildCrewArray(selectedArray, animals);
+console.log(`${crew[0].name}, ${crew[1].name}, and ${crew[2].name} are going to space!`);
diff --git a/objects-and-math/studio/ObjectsStudio02.js b/objects-and-math/studio/ObjectsStudio02.js
index 987bd46bfe..4a1582efa6 100644
--- a/objects-and-math/studio/ObjectsStudio02.js
+++ b/objects-and-math/studio/ObjectsStudio02.js
@@ -1,58 +1,97 @@
 // Code your orbitCircumference function here:
-
+function orbitCircumference(radius) {
+  return Math.round(2 * Math.PI * radius);
+}
 
 // Code your missionDuration function here:
-
+function missionDuration(numOrbits, radius = 2000, speed = 28000) {
+  let circumference = orbitCircumference(radius);
+  let distance = numOrbits * circumference;
+  let time = distance / speed;
+  return parseFloat(time.toFixed(2));
+}
 
 // Copy/paste your selectRandomEntry function here:
-
+function selectRandomEntry(arrayInput) {
+  return arrayInput[Math.floor(Math.random() * arrayInput.length)];
+}
 
 // Code your oxygenExpended function here:
-
+function oxygenExpended(candidate, radius = 2000, speed = 28000) {
+  let spacewalkTime = missionDuration(3, radius, speed);
+  let oxygenUsed = candidate.o2Used(spacewalkTime);
+  return `${
+    candidate.name
+  } will perform the spacewalk, which will last ${spacewalkTime} hours amd require ${oxygenUsed.toFixed(
+    3
+  )} kg of oxygen.`;
+}
 
 // Candidate data & crew array.
 let candidateA = {
-   'name':'Gordon Shumway',
-   'species':'alf',
-   'mass':90,
-   'o2Used':function(hrs){return 0.035*hrs},
-   'astronautID':414
- };
- let candidateB = {
-   'name':'Lassie',
-   'species':'dog',
-   'mass':19.1,
-   'o2Used':function(hrs){return 0.030*hrs},
-   'astronautID':503
- };
- let candidateC = {
-   'name':'Jonsey',
-   'species':'cat',
-   'mass':3.6,
-   'o2Used':function(hrs){return 0.022*hrs},
-   'astronautID':796
- };
- let candidateD = {
-   'name':'Paddington',
-   'species':'bear',
-   'mass':31.8,
-   'o2Used':function(hrs){return 0.047*hrs},
-   'astronautID':291
- };
- let candidateE = {
-   'name':'Pete',
-   'species':'tortoise',
-   'mass':417,
-   'o2Used':function(hrs){return 0.010*hrs},
-   'astronautID':599
- };
- let candidateF = {
-   'name':'Hugs',
-   'species':'ball python',
-   'mass':2.3,
-   'o2Used':function(hrs){return 0.018*hrs},
-   'astronautID':890
- };
- 
- let crew = [candidateA,candidateC,candidateE];
- 
\ No newline at end of file
+  name: "Gordon Shumway",
+  species: "alf",
+  mass: 90,
+  o2Used: function (hrs) {
+    return 0.035 * hrs;
+  },
+  astronautID: 414,
+};
+let candidateB = {
+  name: "Lassie",
+  species: "dog",
+  mass: 19.1,
+  o2Used: function (hrs) {
+    return 0.03 * hrs;
+  },
+  astronautID: 503,
+};
+let candidateC = {
+  name: "Jonsey",
+  species: "cat",
+  mass: 3.6,
+  o2Used: function (hrs) {
+    return 0.022 * hrs;
+  },
+  astronautID: 796,
+};
+let candidateD = {
+  name: "Paddington",
+  species: "bear",
+  mass: 31.8,
+  o2Used: function (hrs) {
+    return 0.047 * hrs;
+  },
+  astronautID: 291,
+};
+let candidateE = {
+  name: "Pete",
+  species: "tortoise",
+  mass: 417,
+  o2Used: function (hrs) {
+    return 0.01 * hrs;
+  },
+  astronautID: 599,
+};
+let candidateF = {
+  name: "Hugs",
+  species: "ball python",
+  mass: 2.3,
+  o2Used: function (hrs) {
+    return 0.018 * hrs;
+  },
+  astronautID: 890,
+};
+
+let crew = [candidateA, candidateC, candidateE];
+
+let numOrbits = 5;
+let orbitRadius = 2000;
+let orbitalSpeed = 28000;
+let totalDistance = orbitCircumference(orbitRadius) * numOrbits;
+let totalDuration = missionDuration(numOrbits, orbitRadius, orbitalSpeed);
+console.log(
+  `The mission will travel ${totalDistance} km around the planet, and it will take ${totalDuration} hours to complete.`
+);
+let selectedCrewMember = selectRandomEntry(crew);
+console.log(oxygenExpended(selectedCrewMember));
diff --git a/objects-and-math/studio/ObjectsStudio03.js b/objects-and-math/studio/ObjectsStudio03.js
index 296b74d873..a0e3f5005d 100644
--- a/objects-and-math/studio/ObjectsStudio03.js
+++ b/objects-and-math/studio/ObjectsStudio03.js
@@ -1,9 +1,34 @@
 // Code your crewMass function here:
-
+function crewMass(crew) {
+  let totalMass = 0;
+  for (let member of crew) {
+    totalMass += member.mass;
+  }
+  return parseFloat(totalMass.toFixed(1));
+}
 
 // Code your fuelRequired function here:
+function fuelRequired(crew, rocketMass = 75000) {
+  let totalCrewMass = crewMass(crew);
+  let totalMass = rocketMass + totalCrewMass;
+  
+
+  let baseFuelRequired = totalMass * 9.5;
+
+  let extraFuel = 0;
+  for (let member of crew) {
+    if (member.species === 'dog' || member.species === 'cat') {
+      extraFuel += 200;
+    } else {
+      extraFuel += 100;
+    }
+  }
 
 
+  let totalFuelRequired = Math.ceil(baseFuelRequired + extraFuel);
+
+  return totalFuelRequired;
+}
 // The pre-selected crew is in the array at the end of this file.
 // Feel free to add, remove, or switch crew members as you see fit.
 
@@ -50,5 +75,9 @@ let candidateA = {
    'astronautID':890
  };
  
- let crew = [candidateB,candidateD,candidateF];
+let crew = [candidateB, candidateD, candidateF];
+ 
+let totalCrewMass = crewMass(crew);
+let totalFuelRequired = fuelRequired(crew);
+console.log(`The mission has a launch mass of ${75000 + totalCrewMass} kg and requires ${totalFuelRequired} kg of fuel.`);
  
\ No newline at end of file