There are two coefficients, 11 for r and 7 for s
It means 1.8 × 10 to the tenth power. the E is a ten are you working with scientific notation
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Answer:
432 ft²
Step-by-step explanation:
The formula of finding the area of a trapezoid: (base 1 + base 2/ 2) x h
(base 1 + base 2/ 2) x h
= (20 + 28/2) x 18
= 24 x 18
= 432 ft²