A rectangular gift box measures 8 inches by 10 inches by 3 inches. what is the surface area?

A=184 square inches

B=214 square inches

C=240 square inches

D=268 square inches

SA = 2 (wl + hl + hw)

SA = 2 ((3) (10) + (8) (10) + (8) (3))

Multiply:

SA = 2 (30 + 80 + 24)

Add:

SA = 2 (134)

Multiply:

SA = 268

8 x 10 = 80 inches squared (one side)

3 x 8 = 24 inches squared (one side)

3 x 10 = 30 inches squared (one side)

80 + 24 + 30 = 134 inches squared (three sides)

Double that for all 6 sides. 2 x 134 = 268 square inches.

The answer is D.