Find two positive real numbers whose product is a maximum and whose sum of the first number and four times the second is 160.
A. 
B. 
C. 
D. 
E. 
Answer: C
Mathematics
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Use logarithmic differentiation to find the derivative of y with respect to the independent variable.y = (x + 5) sin x
A. sin x ln (x + 5)
B. 
(x + 5) sin x
C. (x + 5) sin x
D. cos x ln (x + 5) + 
Mathematics
Use a calculator to perform the operation. Express your answer in scientific notation.0.0000725(0.00473)(2,450,000,000)
A. 8.40 × 10-14 B. 8.40 C. 8.40 × 102 D. 8.40 × 107
Mathematics
Solve the system of linear equations. 8x - 6y = 42 2x + 2y = -14
A. (0, -6) B. (0, -7) C. (-1, -6) D. No solutions
Mathematics
Find the opposite (additive inverse) of the number.26
A. -26
B. 26
C. 
D. 0
Mathematics