Use a graphing calculator to plot the data and find the quadratic function of best fit.Southern Granite and Marble sells granite and marble by the square yard. One of its granite patterns is price sensitive. If the price is too low, customers perceive that it has less quality. If the price is too high, customers perceive that it is overpriced. The company conducted a pricing test with potential customers. The following data was collected. Use a graphing calculator to plot the data. What is the quadratic function of best fit? Round values to the nearest thousandth.
A. B(x) = -0.0243x2 + 3.115x + 22.126
B. B(x) = -0.243x2 + 3.115x - 22.126
C. B(x) = 0.0243x2 - 3.115x - 22.126
D. B(x) = -0.0243x2 + 3.115x - 22.126
Answer: D
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Perform the indicated operation. Simplify if possible.
+ 
A. 
B. 
C. 8x
D. 
Solve the problem.Jill is 
away from Joe. Both begin to walk toward each other at the same time. Jill walks at 
per hour. If they meet in 2 hours, how fast is Joe walking?
A. 4.5 km per hour B. 3.5 km per hour C. 2 km per hour D. 2.5 km per hour
Solve the problem.Assume the cost of a car is $20,000. With continuous compounding in effect, the cost of the car will increase according to the equation C = 20,000ert, where r is the annual inflation rate and t is the number of years. Find the number of years it would take to double the cost of the car at an annual inflation rate of 5.9%. Round the answer to the nearest hundredth.
A. 167.86 years B. 11.75 years C. 1.68 years D. 179.60 years
Solve the problem.Police use the formula s = 
to estimate the speed s of a car in miles per hour, where d is the distance in feet that the car skidded and f is the coefficient of friction. If the coefficient of friction on a certain gravel road is 0.25 and a car skidded 350 feet, find the speed of the car, to the nearest mile per hour.
A. 2625 mph B. 102 mph C. 51 mph D. 281 mph