Simplify the expression.
?
?
A. 
B. 0
C. ?
D. ?
E. already simplified
Answer: C
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Represent the vector in the form v = ai + bj whose magnitude and direction angle are given.
= 10; ? = 120°
A. v = 5
i - 5j
B. v = -5i + 5
j
C. v = -5
i + 5
j
D. v = 5i - 5
j
Find the perimeter.
A. 379 mi B. 308 mi C. 456 mi D. 399 mi
Solve the problem.A ball is thrown directly upward from the top of a building that is 128 feet high. The height of the ball after t seconds is given by the trinomial 
feet. Write this polynomial in factored form.
A. 16(t2 + 2t + 4) B. -16(t + 2)(t - 4) C. -16(t2 + 2t + 4) D. 16(t - 2)(t + 4)
Suppose the point (2, 4) is on the graph of y = f(x). Find a point on the graph of the given function.The reflection of the graph of y = f(x) across the x-axis
A. (-2, 4) B. (-2, -4) C. (2, 4) D. (2, -4)