The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 + y2 - 4x = 0
A. r cos2 ? = 4 sin ?
B. r sin2 ? = 4 cos ?
C. r = 4 sin ?
D. r = 4 cos ?
Answer: D
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Find f(x) and g(x) such that h(x) = (f ? g)(x).h(x) = 
A. f(x) = x, g(x) = 8x + 3
B. f(x) = -
, g(x) = 8x + 3
C. f(x) = 
, g(x) = 8x + 3
D. f(x) = 
, g(x) = 8x - 3
Solve the problem.The price P of a certain computer system decreases immediately after its introduction and then increases. If the price P is estimated by the formula P = 120t2 - 1500t + 6100, where t is the time in months from its introduction, find the time until the minimum price is reached.
A. 25 months B. 12.5 months C. 6.3 months D. 7.5 months
Solve the problem.An object's altitude, in meters, is given by the polynomial h + vt - 4.9t2, where h is the height in meters from which the launch occurs, v is the initial upward speed in meters per second, and t is the number of seconds for which the rocket is airborne. A pebble is shot upward from the top of a building 171 meters tall. If the initial speed is 35 meters per second, how high above the ground will the pebble be after 3 seconds? Round results to the nearest tenth of a meter.
A. 320.1 meters B. 503.9 meters C. 261.3 meters D. 231.9 meters
Arrange the group of numbers in order, from least to greatest.9
, 9.91, 9.091, 8
A. 9.091, 9
, 9.91, 8
B. 8
, 9.91, 9.091, 9
C. 9.91, 9
, 9.091, 8
D. 8
, 9.091, 9
, 9.91