For the given polar equation, write an equivalent rectangular equation.r2 = 22r cos ?
A. x = 22
B. (x - 11)2 + y2 = 0
C. x2 + (y - 11)2 = 121
D. (x - 11)2 + y2 = 121
Answer: D
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Write the Babylonian numeral as a Hindu-Arabic numeral.
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A. 1930
B. 1803
C. 1805
D. 1705
The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport. 
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A. after 3 p.m. B. from 12 p.m. until 3 p.m C. from 9 a.m. until 12 p.m. and from 3 p.m. until 6 p.m. D. from 9 a.m. until 11 a.m. and from 3 p.m. until 6 p.m.
Identify the angles that are congruent.
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Solve the problem.The percent of concentration of a certain drug in the bloodstream 
after the drug is administered is given by K(x) = 
. At what time is the concentration a maximum?
A. 6.4 hr B. 4 hr C. 3.2 hr D. 8 hr