Question

A rectangular prism has length seven meters, width five meters , and volume three hundred fifteen cubic meters. What is the height of the prism?

eight meters

nine meters

twelve meters

thirty-five meters

Answer 1

Ok the volumes of a rectangular prism is lwh=v
we are given l=7m w=5m and v=31mm^3
so we must plug them into the equation

Answer 2

ok

Answer 3

You can ignore the m for now that is just the label.

Answer 4

k

Answer 5

Can you plug them in the equation? the numbers?

Answer 6

And the v is actually 315 sorry

Answer 7

ill probably know how if i could get an example. My teachers never taught me this stuff -.-

Answer 8

Thanks for taking your time and helping me btw

Answer 9

Oh okay the formula of a rectangular prism to find the volume is to multiply the length, width, and height. Since we are given 3 of these.. we can solve for the 4th one.
In the equation v=l*w*h, l= the length of it, w=the width of it and h=the height of it. we are trying to find the height so that will be the unknown we are solving for

Answer 10

So 7 x 5 x 31?

Answer 11

Not quite, what they are saying is 7x5xh=315

Answer 12

Ahh. Got it. Sorry.

Answer 13

Do you know where to go from there then?

Answer 14

well we know 7x5 is 35

Answer 15

Yes now if 35h=315, what must you do to find h, you must do the opposite so what is the opposite of multiplication?

Answer 16

9

Answer 17

division

Answer 18

That's correct good job!

Answer 19

h=9meters!

Answer 20

Thanks! Mind helping me with some other ones?

Answer 21

Sure

Answer 22

K