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Answer:
3 ft
Step-by-step explanation:
The formula for the area of a trapezoid is ...
A = 1/2(b1 +b2)h
Filling in the given information, we can solve for h.
15 ft² = 1/2(4 ft +6 ft)h
15 ft² = (5 ft)h
h = (15 ft²)/(5 ft) = 3 ft
The height of the trapezoid is 3 feet.