Solve the problem. Round to the nearest hundredth of a percent if needed.Use of the internet for shopping is increasing dramatically, but still is somewhat age dependent. When a popular web site that sells books asked the age of users who bought products from them over the internet, they obtained the following data. What is the probability that a buyer on this web site is aged 
A. 3.16%
B. 3.14%
C. 2.32%
D. 2.27%
Answer: D
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A variable force of magnitude F(x) moves a body of mass m along the x-axis from x1 to x2. The net work done by the force in moving the body from x1 to x2 is 
where v1 and v2 are the body's velocities at x1 and x2. Knowing that the work done by the force equals the change in the body's kinetic energy, solve the problem.A 2-oz tennis ball was served at 130 ft/sec about (89 mph). How much work was done on the ball to make it go this fast? (To find the ball's mass from its weight, express the weight in pounds and divide by 32 ft/sec2, the acceleration of gravity.)
A. 31 ft-lb B. 33 ft-lb C. 66 ft-lb D. 15 ft-lb
Divide.61.65 ÷ 5
A. 12.33 B. 12.6 C. -13.03 D. 13.03
Solve the system.7x - y = 7-14x +2y = -14
A. {(x, 14x - 7)} B. {(x, 7x - 7)} C. ? D. {(x, 7 - 7x)}
Solve the problem. Round to the nearest dollar if needed.Looking ahead to retirement, you sign up for automatic savings in a fixed-income 401K plan that pays 5.5% per year compounded annually. You plan to invest $2500 at the end of each year for the next 20 years. How much will your account have in it at the end of 20 years?
A. $88,469 B. $85,628 C. $87,171 D. $88,941