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What is the area of this rectangle?
3
7b ft
7
3
b+21 ft

What is the area of this rectangle? 3 7b ft 7 3 b+21 ft-example-1
User Sonnyb
by
8.2k points

1 Answer

3 votes

Explanation:

the area of a rectangle is

length × width.

in our case that is

(7/3 × b + 21) × (3/7 × b) =

= 7/3 × 3/7 × b × b + 21 × 3/7 × b =

= 1 × b² + 3×3 × b = b² + 9b = b(b + 9) ft²

so, the area is

b² + 9b = b(b + 9) ft²

remember, an area is always a square "something".

a volume a cubic "something".

so, when the lengths are given in feet, the areas are square feet or ft².

User Bnjmn
by
8.6k points

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