Find the partial derivative.Find fy(3, -1) when f(x, y) = 8xy - 6y.
A. 18
B. 0
C. -8
D. 24
Answer: A
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Estimate the answer from the table or graph.In a shop that sells a variety of nuts, the prices of some items are as given below. If Sarah buys 
cashews, 1 lb of walnuts, and 2 lb of raisins, how much did she have to pay? 
A. $23.80 B. $19.90 C. $16.00 D. $26.90
Express the sum or difference as a product of sines and/or cosines.cos(4?) + cos(2?)
A. 2 sin(3?) sin ? B. 2 cos(3?) cos ? C. 2 cos(3?) sin ? D. 2 cos(3?)
Find the domain and range for the function.
A. D: {-5, -2,3, 5}; R: {-4, -3, 1, 2, 3} B. D: {-4, -3, 0, 1, 2, 3}; R: {-5, -2,3, 5} C. D: {-5, -2,3, 5}; R: {-4, -3, 0, 1, 2, 3} D. D: {-4, -3, 1, 2, 3}; R: {-5, -2,3, 5}
Solve the problem. Use 3.14 as an approximation for ? where appropriate.A rectangular box which is 3 in. by 8 in. by 6 in. is to be wrapped in brown paper. How much paper is required?
A. 180 in.2 B. 144 in.2 C. 132 in.2 D. 90 in.2