Evaluate without using a calculator.cos ?, if tan ? = - 
and sin ? > 0
A. - 
B. 
C. - 
D. 
Answer: A
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Find the y- and x-intercepts for the equation. Then graph the equation.4x - 16y = 16
A. (0, -1), (-4, 0)
B. (0, -1), (4, 0)
C. (0, -4), (1, 0)
D. (0, 4), (-1, 0)
Determine whether the variation between the indicated quantities is direct or inverse.The acceleration of a jet-powered dragster and its posted elapsed time for the quarter mile. (Assume the driver is able to keep the dragster on a straight path.)
A. Inverse B. Direct
Graph the pair of parametric equations with the aid of a graphing calculator.x = 5 tan t, y = 3 sec t; -?/2 ? t ? ?/2 
A. 
B. 
C. 
D. 
Solve the problem.An airplane flying faster than the speed of sound creates sound waves that form a cone. If ? is the vertex angle of the cone and m is the Mach number for the speed of the plane, then 
Find ? to the nearest degree if 
A. 43° B. 45° C. 40° D. 38°