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  1–4  It looks like you need to review the area formulas for triangle, trapezoid, and rectangle. Pay particular attention to those that have a factor of 1/2.

  5  correct

Step-by-step explanation:

Area formulas:

Triangle: A = (1/2)bh . . . . where b is the base and h is the height

Trapezoid: A = (1/2)(b₁ +b₂)h . . . . where b₁ and b₂ are the lengths of the parallel bases and h is the perpendicular distance between them (the height)

Rectangle: A = bh . . . . where b is the length of one side and h is the length of the perpendicular side.

Parallelogram: A = bh . . . . where b is the length of one side and h is the perpendicular distance between that and the opposite side (the height)

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The rectangle formula applies. b=23 ft, h=12 ft

The triangle formula applies to each blade. b=7 ft, h=4 ft. The total area of 4 blades is desired.

The trapezoid formula applies. b₁=11 cm, b₂=5 cm, h=4 cm.

The parallelogram formula applies. b=10 mm, h=8 mm. Evaluating the answers, the triangle, trapezoid, and rectangle formulas apply.

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