Solve.If the voltage, V, in an electric circuit is held constant, the current, I, is inversely proportional to the resistance, R. If the current is 180 milliamperes when the resistance is 3 ohms, find the current when the resistance is 18 ohms.
A. 30 milliamperes
B. 1080 milliamperes
C. 90 milliamperes
D. 1074 milliamperes
Answer: A
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Find the foci of the given hyperbola.y2 - 36x2 = 36
A. (0, 
), (0, -
)
B. (
, 0), (-
, 0)
C. (6, 0), (-6, 0)
D. (0, 6), (0, -6)
Solve the problem.A rectangular garden has dimensions of 17 ft by 14 ft. A gravel path of equal width is to be built around the garden. How wide can the path be if there is enough gravel for 
A. 8.5 ft B. 7 ft C. 8 ft D. 6 ft
Solve.The function A = A0e-0.01155x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 300 pounds of the material are placed in the vault, how much time will need to pass for only 53 pounds to remain?
A. 300 yr B. 155 yr C. 150 yr D. 160 yr
Solve the problem.Zina is paid $30 per hour for a 40-hour workweek, but is paid time and a half for overtime work. Give expressions for Zina's pay if she works t hours. Distinguish between the cases where t is less than and greater than 40.
A. For t ? 40, Zina's pay is $30t. For t > 40, Zina's pay is $1200 + ($45)t B. For t ? 40, Zina's pay is $30t. For t > 40, Zina's pay is $45t C. For t ? 40, Zina's pay is $30t. For t > 40, Zina's pay is $1200 + (t - 40)($45) D. For t ? 40, Zina's pay is $30t. For t > 40, Zina's pay is $1200 + (t - 40)($60)