Find the partial derivative.Let z = g(x,y) = 7x + 4x2y2 - 2y2. Find 
.
A. 8yx - 8y
B. 8yx - 4y
C. 8yx2 - 4y
D. 7 + 8yx2
Answer: C
Mathematics
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Find the sum of the series.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A company determines that its marginal cost, in dollars, for producing x units of a product is given by 
where x ? 1. Suppose that it would be possible for the company to make infinitely many units of this item. Find the total cost. Round to the nearest dollar.
A. $21,550 B. $21,480 C. $21,400 D. $21,500
Mathematics
Use a power-reducing identity to find the exact value of the expression.csc2 (-157.5°)
A. 
B. 4 + 2
C. 8 + 4
D. 4
Mathematics
Use the quadratic formula to solve the equation.x2 + 6x + 9 = 0
A. {3} B. {-3} C. {-3, 3} D. {3 - i, 3 + i}
Mathematics