Solve the problem.If $2000 is invested at 10% annual interest, how much should be invested at 12% annual interest so that the total yearly income from both investments is $5000?
A. $4000
B. $4760
C. $40,000
D. $47,600
Answer: C
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Make the required change in the given equation.r = 7 to spherical coordinates
A. cos ? = 
B. ?2(1 - cos ?) = 49
C. ? = 7 sin ?
D. ? = 7 csc ?
Solve the problem.A rectangular field is to be enclosed on four sides with a fence. Fencing costs $4 per foot for two opposite sides, and $5 per foot for the other two sides. Find the dimensions of the field of area 750 ft2 that would be the cheapest to enclose.
A. 34.2 ft @ $4 by 21.9 ft @ $5 B. 24.5 ft @ $4 by 30.6 ft @ $5 C. 30.6 ft @ $4 by 24.5 ft @ $5 D. 21.9 ft @ $4 by 34.2 ft @ $5
Indicate whether the value of x shown is a solution to the given equation.2x = 14, x = 7
A. Yes B. No
Solve the problem.A boat can go 20 mph in still water. It takes as long to go 140 miles upstream as it does to go downstream 210 miles. How fast is the current?
A. 4 mph B. 3 mph C. 1 mph D. 7 mph