Use identities to simplify the expression.cot x sec x sin x
A. tan2 x
B. sec2 x
C. csc2 x
D. 1
Answer: D
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Find all the first order partial derivatives for the following function.f(x, y, z) = ln (xy)z
A. 
= - 
; 
= - 
; 
= ln xy
B. 
= 
; 
= 
; 
= z ln (xy)z-1
C. 
= z ln 
; 
= zln
; 
= ln xy
D. 
= 
; 
= 
; 
= ln xy
Write the number in scientific notation.0.000005859
A. 5.859 × 106 B. 5.859 × 10-7 C. 5.859 × 10-5 D. 5.859 × 10-6
Solve.The function 
represents the yearly income (or loss) from a real estate investment, where t is time in years. After what year does income begin to decline?
A. 8.5 B. 7.5 C. 11.33 D. 17
Solve the problem.A grain dealer sold to one customer 9 bushels of wheat, 3 of corn, and 5 of rye for $40.90; to another, 3 of wheat, 5 of corn, and 9 of rye for $47.30; and to a third, 5 of wheat, 9 of corn, and 3 of rye for $46.10. What was the price per bushel for corn?
A. $1.90 B. $2.40 C. $2.90 D. $3.10