Find the exact value of the expression.cos 
A. 
B. 
C. 
D. 
Answer: D
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Find an equation for the sphere with the given center and radius.Center (0, 0, 8), radius = 5
A. x2 + y2 + 5 z2 - 16z = -39 B. x2 + y2 + 5 z2 + 16z = -39 C. x2 + y2 + z2 + 16z = -39 D. x2 + y2 + z2 - 16z = -39
Identify the correspondence.The two triangles shown below are congruent. List the vertices corresponding to A, B ,and C in order. 
A. X, Y and Z B. Y,X and Z C. Z, X and Y D. Y, Z and X
Find the product and write the result in standard form.6i(-9i + 6)
A. -54 + 36i B. 36i + 54i2 C. 36i - 54i2 D. 54 + 36i
Solve.The three angles in a triangle always add up to 180°. If one angle in a triangle is 72° and the second is 5 times the third, what are the three angles?
A. 72°, 89°, 19° B. 72°, 88°, 20° C. 72°, 90°, 18° D. 72°, 91°, 17°