28. The perimeter of a rectangle is 42 feet. The length of the
rectangle is 12 feet. What is the
width of the rectangle?
A 9 ft
B 12 ft
C 15 ft
D 30 ft

P=2(L+W)

42=2(12+W)

42=24+2w

2w=42-24

2w/2=18/2

w=9

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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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