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

1gm = 1000mg so 0.1gm = 1000mg

first, convert the weight to kg

160lb * 1kg/2.2lb = 72.7kg

next, the dose

72.7kg * 100mg/kg = 7270mg