Find the partial derivative.Let z = f(x,y) = 5x2 - 12xy + 6y3. Find 
.
A. 10x - 12y
B. 10x + 12y2
C. -12x - 18y
D. -12x + 18y2
Answer: A
Mathematics
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Find the absolute value.
A. -7.4 B. 7.4 C. ± 7.4 D. 0
Mathematics
Solve the problem.The voltage E in an electrical circuit is given by E = 6.4 cos 110?t, where t is time measured in seconds. Find the period.
A. 
B. 55
C. 
D. 55?
Mathematics
Multiply. Write the answer in descending order and combine like terms.(x + 2)2
A. x + 4 B. 4x2 + 4x + 4 C. x2 + 4 D. x2 + 4x + 4
Mathematics
Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.sec 
A. 
B. -
C. - 
D. -2
Mathematics