Complete the identity.tan4 ? - sec4 ? = ?
A. sec2 ? + tan2 ?
B. sec2 ?
C. -2 tan2 ? - 1
D. tan 2 ? - sec2 ?
Answer: C
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Find the slope of the curve at the given point P and an equation of the tangent line at P.y = 4 - x3, (-1, 5)
A. slope is 0; y = 2 B. slope is -1; y = -x + 2 C. slope is 3; y = 3x + 2 D. slope is -3; y = -3x + 2
Find a value of a so that f is continuous at c, or indicate this is impossible.f(x) = 
A. 25 B. Impossible C. -5 D. 5
Find the probability of the event if a single choice is made from a bag.A bag contains 7 red marbles, 6 blue marbles, 5 yellow marbles, and 3 green marbles. What is the probability of choosing a yellow or green marble when one marble is drawn?
A. 
B. 
C. 
D. 
Write the vertex form of a parabola that satisfies the conditions given. Assume that a = ±1.Opens downward, vertex (-6, -4)
A. y = (x + 6)2 - 4 B. y = -(x - 6)2 + 4 C. y = -(x + 6)2 - 4 D. y = (x - 6)2 + 4