Question

The area of rectangular piece of metal is 30 centimeters. The peice is 4 centimeters wide. How long is it

Answer 1

Answer:

7.5

Step-by-step explanation:

30/4=7.5

Answer 2

Answer:

7.5 cm

Step-by-step explanation:

The formula of an area of a rectangle:

$A=w\cdot l$

w - width

l - length

We have

$A=30\ cm^2;\ l=4\ cm$

Substitute:

$30=4w$         divide both sides by 4

$\dfrac{30}{4}=\dfrac{4\!\!\!\!\diagup w}{4\!\!\!\!\diagup}\\\\7.5=w\to w=7.5\ cm$