Find the foci of the hyperbola.y2 - x2 = -162
A. (9, 0) and (-9, 0)
B. (0, 18) and (0, -18)
C. (18, 0) and (-18, 0)
D. (
, 0) and (-
, 0)
Answer: C
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Find the intervals on which the function is continuous.y = 
A. discontinuous only when x = -6 or x = 3 B. discontinuous only when x = -3 or x = 6 C. discontinuous only when x = 3 D. discontinuous only when x = 3 or x = 6
Solve.3x2 - 45 = 0
A. -
, 
B. ±15
C. 16
D. 22.5
Use both properties of equality to solve the equation.-3y - 40 = 5y - 16
A. 5 B. -3 C. 3 D. -5
Solve the problem.A nuclear scientist has a sample of 
of a radioactive material which has a half-life in hours. She monitors the amount of radioactive material over a period of a day and obtains the following data. Use a graphing utility to fit an exponential function to the data. Predict the amount of material remaining at 40 hours.
.
A. y = 86e-0.071x, 5.0 mg B. y = 100e-0.077x, 4.6 mg C. y = 92e-0.0686x, 5.9 mg D. y = 100e-0.077x, 6.7 mg