Solve the problem.A rectangular field is to be enclosed on four sides with a fence. Fencing costs 
per foot for two opposite sides, and 
per foot for the other two sides. Find the dimensions of the field of area 
that would be the cheapest to enclose. Round to the nearest tenth.
A. 30 ft @ $4 by 24 ft @ $5
B. 24 ft @ $4 by 30 ft @ $5
C. 33.5 ft @ $4 by 21.5 ft @ $5
D. 21.5 ft @ $4 by 33.5 ft @ $5
Answer: A
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Solve the problem. Round to the nearest dollar.Central Street bought a rolling machine that cost $58,000. The expected life is 600,000 hours of production with a salvage value of $5,800. Find the book value at the end of the third year. Use the units-of-production method of depreciation given the following production schedule.Year 1135,000 hoursYear 2129,000 hoursYear 3121,000 hours
A. $17,550 B. $20,783 C. $34,650 D. $23,350
Find the angle between the given vectors. Round to the nearest tenth of a degree.u = 9i + 6j, v = 2i - 3j
A. 45° B. 90° C. 35° D. 100°
For the function f, construct and simplify the difference quotient 
.f(x) = 
A. 
B. 
C. 
D. - 
Solve.The formula D = 16t2 is used to approximate the distance in feet an object falls in t seconds. A package is dropped from an airplane that is 3600 feet above the ground. How many seconds elapse before it hits the ground?
A. 15 seconds B. 225 seconds C. 30 seconds D. 57,600 seconds