Processing math: 100%
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Find the Surface Area box (3)(7)(5)

h=3l=7w=5

Step 1
The surface area of a box is equal to the sum of the areas of each side of the box.
2(length)(width)+2(length)(height)+2(width)(height)

Step 2
Substitute the values of the length l=7, the width w=5, and the height h=3 into the formula.
275+273+253

Step 3
Simplify each term.

Multiply 275.

Multiply 2 by 7.
145+273+253
Multiply 14 by 5.
70+273+253
70+273+253
Multiply 273.

Multiply 2 by 7.
70+143+253
Multiply 14 by 3.
70+42+253
70+42+253
Multiply 253.

Multiply 2 by 5.
70+42+103
Multiply 10 by 3.
70+42+30
70+42+30
70+42+30

Step 4
Simplify by adding numbers.

Add 70 and 42.
112+30
Add 112 and 30.
142
142