Tell whether a linear model or a quadratic model is appropriate for the data. If a quadratic model is appropriate, then decide also whether the lead coefficient should be positive or negative.The height of a bouncing ball during one bounce, as a function of time.
A. Linear
B. Quadratic; leading coefficient negative
C. Quadratic; leading coefficient positive
Answer: B
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Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them. 2x + 5y = 2 4x - 2y = -20
A. Unlimited: x = -4, y = 2; x = -4, y = -2 B. x = -4, y = 2 C. x = -4, y = -2 D. Inconsistent
Find the nth term an of the geometric sequence.7, -14, 28, -56, 112, . . .
A. an = (7)(-2)n-1 B. an = a1 - 2n C. an = (7)(-2n) D. an = (7)(-2)n
Perform the specified calculation.For the vectors u = 
and w = 
, calculate |-5u| - |4w|.
A. 5
- 4
B. 5
+ 4
C. -5
- 4
D. 5
- 4
Solve the problem.If two angles are complementary, the sum of their angles is 90°. If one angle measures 23°, find the measure of the other angle.
A. 44° B. 90° C. 67° D. 157°