Simplify the expression. Assume all variables represent nonzero real numbers.68 ? 65
A. 613
B. 1213
C. 640
D. 3640
Answer: A
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Find all solutions of the equation. Leave answers in trigonometric form.x2 - 36 = 0
A. {6
cis 235°, 6
cis 135°}
B. {6 cis 180°, 6 cis 0°}
C. {6
cis 45°, 6
cis 225°}
D. {6 cis 90°, 6 cis 270°}
Rewrite the expression as the sum and/or difference of logarithms, without using exponents. Simplify if possible.log2
A. 8 log2x + 7 log2y + log25 B. (8 log2x)(7 log2y) - log25 C. 8 log2x - 7 log2y - log25 D. 8 log2x + 7 log2y - log25
Solve the problem.Find out how long it takes a $2800 investment to double if it is invested at 
compounded semiannually. Round to the nearest tenth of a year. Use the formula 
.
A. 7.9 years B. 8.3 years C. 8.1 years D. 7.7 years
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. 3x - 2y + 2z - w=2 4x + y + z + 6w=8-3x + 2y - 2z + w=55x + 3z - 2w=1
A. {(1, - 
, 
, 6)}
B. ?
C. {(2, 0, - 
, 
)}
D. {(
, 0, - 
, 
)}