Find the product of the complex number and its conjugate.2 + 3i
A. 4 + 9i
B. 4 - 9i
C. -5
D. 13
Answer: D
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Find the volume under the surface z = f(x,y) and above the rectangle with the given boundaries.z = 8x + 4y + 7; R = {(x, y): 0 ? x ? 1, 1 ? y ? 3}
A. 28 B. 38 C. 26 D. 36
Estimate the magnitude of the error involved in using the sum of the first four terms to approximate the sum of the entire series.
, -1 < t ? 1
A. 0.20
B. 
C. 
D. 
Solve the problem.Mardi received an inheritance of $50,000. She invested part at an APR of 11 percent and deposited the remainder in tax-free bonds at an APR of 10 percent. Her total annual income from the investments was $5,300. Find the amount invested at 11 percent.
A. $44,700 B. $15,000 C. $29,000 D. $30,000
Solve the problem.A pendulum bob swings 4.0 cm on its first oscillation. On each subsequent oscillation the bob travels 
of the previous distance. Find the total distance the bob travels before coming to rest.
A. 13.3 cm B. 13.0 cm C. 8.0 cm D. 12.0 cm