Pre Algebra help please?

Question

The square of a number is the 2nd power of the number. The cube of a number is the 3rd power of a number. Explain why these names are reasonable.

AND

An aquarium has a square base with a side the length of 15 inches. You fill the aquarium with water to a height of 15 inches.

a: Find the volume of water in the aquarium

b:A cubic inch of water weighs 0.036 pounds. Find the approxomite weight of the water in the aquarium.

Thanks! And this time, please no answers telling me Im dumb please, Im only in 7th grade.

Answer 1

The first answer stole my opinion.  

Answer 2

A square is two-dimensional. A cube is three-dimensional.

Volume equals length times width times height.

If it has a square base and the length is 15, then a square (with equal sides) also has a width of 15. And the height is given.

Answer 3

You are working with algebra - this isn't hard and you are not dumb.

A square has 2 sides of equal length - it's area is the length to the 2nd power - a square

A cube has 3 sides of equal length - it's volume is the length times the width times the height. Since height, length, and width are all the same - we have a number to the 3rd power - a cube

Here is the trick to getting part a and b.

volume = 15 cubed = 15 x 15 x 15 (in.^3)

part b tells us that there are 0.036 lb/(in^3) of water

If we multiply  lb / (in^3) by (in^3) we are left with our answer in lb.

in^3/in^3 gets that part to reduce to 1 - and it falls out of the dimensions to leave us the weight in pounds.

15*15*15*0.036 pounds is the answer to part b.

Keep practicing - you can do it!

Answer 4

You aren't dumb - in fact you're smart enough to employ Y! answers community in doing your homework at a cost to you of a few virtual points that are really worth nothing!

Lazy - yes, but not dumb at all.

The problem is - if the community does do the homework for you, how will you take it through the test? Are you going to take your laptop along ad ask us to do your test questions as well? What about real life situation, when, for example you're in the store and need to buy some supply for your aquarium and the bottle says that you need 1 ounce of the solution per 2 cubic feet of water, but you only know the height length and depth of your aquarium?

I am sure the answer is in your book or in your school notes. Take a quick look, and you'll find it out!

LEM.