Which number is a perfect cube? 9 18 27 36

27 is the perfect cube in your list

Hi!

A number that has a perfect cube is a number that can be solved like this

x³ = n

Let's test all these numbers.

9

Does 9 have a perfect cube? Let's factorize it to find out.

9/3 = 3

3/3 = 1

3 * 3 is 9's factorization. That is not a perfect cube.

18

Do the same thing.

18/2 = 9

9/3 = 3

3/3 = 1

2 * 3 * 3 is 18's factorization. It is not a perfect cube.

27

27/3 = 9

9/3 = 3

3/3 = 1

3 * 3 * 3 is 27's factorization. It is a perfect cube!

3³ = 27

Hope this helps! :)

-Peredhel

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1