Solve.One pound of body weight is lost whenever 3500 calories are burned off. While walking uphill, Cathy burns 320 calories for each mile walked. At this rate, how far must she walk to lose 1 pound? Give your answer to the nearest tenth of a mile.
A. 0.9 mi
B. 11.2 mi
C. 10.9 mi
D. 0.1 mi
Answer: C
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Find the volume of the indicated region.the region bounded by the paraboloid 
and the xy-plane
A. 
?
B. 27?
C. 
?
D. 
?
Solve the problem.Suppose that the daily cost, in dollars, of producing x televisions is C(x) = 0.002x3 + 0.2x2 + 60x + 620, and currently 50 televisions are produced daily. Use C(50) and the marginal cost to estimate the daily cost of increasing production to 53 televisions daily. Round to the nearest dollar.
A. $4660 B. $4655 C. $4475 D. $4712
First, use front end rounding to estimate each answer. Then find the exact answer.There are 1728 cubic inches in a cubic foot. How many cubic inches are there in 
A. estimate: 1730 ? 27 = 46,710 cubic inches; exact: 46,656 cubic inches B. estimate: 1730 ? 30 = 51,900 cubic inches; exact: 46,656 cubic inches C. estimate: 1700 ? 30 = 51,000 cubic inches; exact: 46,656 cubic inches D. estimate: 2000 ? 30 = 60,000 cubic inches; exact: 46,656 cubic inches
Write an algebraic equation and use it to solve the problem.A freight train leaves a station traveling at 32 km/h. Two hours later, a passenger train leaves the same station traveling in the same direction at 52 km/h. How long does it takes the passenger train to catch up to the freight train?
A. 2.2 hours B. 3.2 hours C. 4.2 hours D. 5.2 hours