Question

julie printed out a picture of each of the four members of her favorite band to decorate her bedroom door. each picture measures 8 inches by 10 inches. once decorated, how many square inches of julies door will be covered by these pictures?
oa. 144 square inches
ob. 400 square inches
oc. 240 square inches
od. 320 square inches

Explanation:

Step1: Calculate area of one picture

The area formula for a rectangle is $A = l\times w$. Here, $l = 10$ inches and $w = 8$ inches. So, $A_1=10\times8 = 80$ square - inches.

Step2: Calculate area of four pictures

Since there are 4 pictures, the total area $A_{total}=4\times A_1$. Substitute $A_1 = 80$ into the formula, we get $A_{total}=4\times80=320$ square - inches.

Answer:

D. 320 square inches