9. the length of a rectangular speaker is three
times its width, and the height is four more
than the width. write an expression for the
volume v of the rectangular prism in terms
of its width w.

Step-by-step explanation:

we know that

The volume of a rectangular prism is equal to

-----> equation A

where

L is the length

W is the width

H is the height

we know that

-----> equation B

----> equation C

substitute equation B and equation C in equation A

Apply distributive property

x+14

step-by-step explanation:

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm