Find the value of f(3) if f(x) = 4x^2 - 8x + 3

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

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Solve the triangle. a = 21°, c = 105°, c = 5