// Do not change any of the funcxtion names

const multiplyByTen = (num) => {

// return num after multiplying it by ten

// code here

return num * 10;

};

const subtractFive = (num) => {

// return num after subtracting five

// code here

return num - 5;

};

const areSameLength = (str1, str2) => {

// return true if the two strings have the same length

// otherwise return false

// code here

return (str1.length === str2.length);

};

const areEqual = (x, y) => {

// return true if x and y are the same

// otherwise return false

// code here

return (x === y);

};

const lessThanNinety = (num) => {

// return true if num is less than ninety

// otherwise return false

// code here

return (num < 90);

};

const greaterThanFifty = (num) => {

// return true if num is greater than fifty

// otherwise return false

// code here

return (num > 50);

};

const add = (x, y) => {

// add x and y together and return the value

// code here

return (x + y);

};

const subtract = (x, y) => {

// subtract y from x and return the value

// code here

return (x - y);

};

const divide = (x, y) => {

// divide x by y and return the value

// code here

return (x / y);

};

const multiply = (x, y) => {

// multiply x by y and return the value

// code here

return (x * y);

};

const getRemainder = (x, y) => {

// return the remainder from dividing x by y

// code here

return (x % y);

};

const isEven = (num) => {

// return true if num is even

// otherwise return false

// code here

return (num % 2 === 0);

};

const isOdd = (num) => {

// return true if num is odd

// otherwise return false

// code here

return (num % 2 === 1);

};

const square = (num) => {

// square num and return the new value

// code here

return (num * num);

};

const cube = (num) => {

// cube num and return the new value

// code here

return (num * num * num);

};

const raiseToPower = (num, exponent) => {

// raise num to whatever power is passed in as exponent

// code here

return Math.pow(num, exponent);

};

const roundNumber = (num) => {

// round num and return it

// code here

return Math.round(num);

};

const roundUp = (num) => {

// round num up and return it

// code here

return Math.ceil(num);

};

const addExclamationPoint = (str) => {

// add an exclamation point to the end of str and return the new string

// 'hello world' -> 'hello world!'

// code here

return `${str}!`;

};

const combineNames = (firstName, lastName) => {

// return firstName and lastName combined as one string and separated by a space.

// 'Lambda', 'School' -> 'Lambda School'

// code here

return `${firstName} ${lastName}`;

};

const getGreeting = (name) => {

// Take the name string and concatenate other strings onto it so it takes the following form:

// 'Sam' -> 'Hello Sam!'

// code here

return `Hello ${name}!`;

};

// If you can't remember these area formulas then head over to Google or look at the test code.

const getRectangleArea = (length, width) => {

// return the area of the rectangle by using length and width

// code here

return (length * width);

};

const getTriangleArea = (base, height) => {

// return the area of the triangle by using base and height

// code here

return (base * height) / 2;

};

const getCircleArea = (radius) => {

// return the rounded area of the circle given the radius

// code here

return Math.round(Math.PI * radius * radius);

};

const getRectangularPrismVolume = (length, width, height) => {

// return the volume of the 3D rectangular prism given the length, width, and height

// code here

return (width * length * height);

};

// Do not modify code below this line.

// --------------------------------

module.exports = {

multiplyByTen,

subtractFive,

areSameLength,

areEqual,

lessThanNinety,

greaterThanFifty,

add,

subtract,

divide,

multiply,

getRemainder,

isEven,

isOdd,

square,

cube,

raiseToPower,

roundNumber,

roundUp,

addExclamationPoint,

combineNames,

getGreeting,

getRectangleArea,

getTriangleArea,

getCircleArea,

getRectangularPrismVolume

};