Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.tan 
A. -1
B. 
C. 
D. 1
Answer: D
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Add or subtract as indicated.(12x2 - xy - y2) + (x2 + 10xy + 7y2)
A. 12x2 + 10xy + 7y2 B. 13x2 + 11xy + 8y2 C. 11x2 - 11xy - 8y2 D. 13x2 + 9xy + 6y2
Solve the problem.A 5.1-foot fence is 13.081 feet away from a plant in the direction of the sun. It is observed that the shadow of the fence extends exactly to the bottom of the plant. (See drawing) Find ?, the angle of elevation of the sun at that time. Round the measure of the angle to the nearest tenth of a degree.
A. ? = 21.5° B. ? = 21.1° C. ? = 21.3° D. ? = 22.7°
Provide an appropriate response.For a certain system of two linear equations, the solution set is {-4, 8}, and 
Find the values of Dx and Dy.
A. Dx = -4; Dy = 8
B. Dx = 240; Dy = -120
C. Dx = -120; Dy = 240
D. Dx = - 
; Dy = 
Graph the inequality.3x + 5y ? 15
A. 
B. 
C. 
D. 