Find the vertex.f(x) = (x + 4)2 + 4
A. (0, 4)
B. (4, 0)
C. (-4, -4)
D. (-4, 4)
Answer: D
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Evaluate the expression without using a calculator.log82
A. 
B. 3
C. 6
D. 1
Solve the first-order linear system:
x? = 3/2 x - 3/2y, y'=3x-4y
Solve the problem.Two vertical poles of lengths 20 feet and 32 feet are situated on level ground 50 feet apart, as shown in the figure below. A piece of wire is to be strung from the top of the 20-ft pole, to a stake in the ground, to the top of the 32-ft pole. At what distance from the 20-foot pole should the stake be located to minimize the amount of wire used? Round your answer to the nearest tenth of a foot.20 ft
32 ft? 50 ft
A. 19.5 ft B. 23.3 ft C. 15.5 ft D. 17.2 ft
Use the given triangles to evaluate the expression. Rationalize all denominators. 
sin 
A. 
B. 
C. 
D. 