Please help i also need an explination

4 rolls

Step-by-step explanation:

First we need to find the area of the wall

A = l*w

   = 8*16 = 128

Then we find the area that a roll of wallpaper will cover

A=2*20=40

Divide

128/40 =3.2

We must round up since we cannot buy part of a roll

We need 4 rolls

4

Step-by-step explanation:

Area of the wall = 8 × 16

= 128 ft²

One roll covers an area of:

2 × 20

= 40 ft²

She needs:

128/40 = 3.2 rolls

Since complete rolls are to be bought, she needs to buy 4 rolls

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: