Use a graphing utility to find the sum of the geometric sequence. Round answer to two decimal places, if necessary.4 + 12 + 36 + 108 + 324 + ... + 4 ? 37
A. 13,100
B. 13,120
C. 13,122
D. 13,157
Answer: B
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Find all the second order partial derivatives of the given function.f(x, y) = xye-y2
A. 
= 0; 
= 2xye-y2(2y2 - 3); 
= 
= e-y2(1 - 2y2)
B. 
= ye-y2; 
= 2xye-y2(y2 - 1); 
= 
= e-y2(1 - y2)
C. 
= ye-y2; 
= 2xye-y2(2y2 - 6); 
= 
= e-y2(1 - 2y2)
D. 
= 0 ; 
= 2xye-y2(2y2 - 3); 
= 
= e-y2(1 - y2)
Write the sum in summation notation.7 + 
+ 
+ 
+ . . . + 
A. 
B. 
C. 
D. 
Solve the problem.Marty's Tee Shirt & Jacket Company is to produce a new line of jackets with a embroidery of a Great Pyrenees dog on the front. There are fixed costs of $690 to set up for production, and variable costs of $40 per jacket. Write an equation that can be used to determine the total cost, C(x), encountered by Marty's Company in producing x jackets, and use the equation to find the total cost of producing 72 jackets.
A. $3570 B. $3562 C. $3582 D. $3550
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.Ellen wishes to mix candy worth $1.42 per pound with candy worth $3.35 per pound to form 31 pounds of a mixture worth $2.60 per pound. How many pounds of the more expensive candy should she use? Round your answer to the nearest pound.
A. 19 lb B. 24 lb C. 12 lb D. 14 lb