Find the partial derivative.Find fy(5, -6) when f(x,y) = 7x2 - 9xy.
A. 39
B. -45
C. 129
D. -54
Answer: B
Mathematics
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Write with positive exponents only.
-3
A. 
B. 
C. 
D. 
Mathematics
Use the appropriate identity to find the indicated function value. Rationalize the denominator, if applicable. If the given value is a decimal, round your answer to three decimal places.tan ?, given that cot ? = 
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Michelle earns 20% of the net profit in commission on advertising sales for a magazine. If she receives $989.21 as a commission, what was the net profit on her sales?
A. $4946.05 B. $2473.03 C. $24,730.25 D. $12,365.13
Mathematics
Solve the system of equations by either the addition method or the substitution method.
A. (9.6, -18) B. (-18, 9.6) C. infinite number of solutions D. no solution
Mathematics