Solve the problem.The regular price of a double roll of wallpaper is $21. During a May sale, wallpaper was discounted 20%. What was the sale price of a double roll of wallpaper?
A. $5.20
B. $16.80
C. $17.80
D. $4.20
Answer: B
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For the given polar equation, write an equivalent rectangular equation.r = 10 sin ?
A. 
= 10x
B. x2 + y2 = 10x
C. x2 + y2 = 10y
D. 
= 10y
Solve.y = x2 - 2y = 2x2 - 4
A. (-
, -4), (
, -4)
B. (-
, 0), (
, 0)
C. (-
, -4, (
, 0)
D. (
, 0)
Solve the problem.The growth model f(t) = 
describes the population of a species of butterflies 
after they are introduced to a non-threatening habitat. How many butterflies are expected in the habitat after 14 months?
A. 5040 butterflies B. 1260 butterflies C. 360 butterflies D. 340 butterflies
Solve the problem.Suppose the function T(t) = 0.8t - 2.7 determines the actual time that has elapsed, in minutes, for t minutes of a person's estimate of the elapsed time. Find the actual time that has elapsed for an estimate of t = 120 minutes.
A. 98.7 min B. 93.3 min C. 122.16 min D. 117.84 min