Solve the problem.A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average speed of 45 mph results in a rating of 34 mpg, where as at an average speed of 60 mph, her car rates 29 mpg. Find an equation to model the gas mileage y for an average speed of x mph.
A. y = 3x + 49
B. y = - 
x - 19
C. y = 3x - 19
D. y = - 
x + 49
Answer: D
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Graph the system of inequalities. Shade the region that represents the solution set.x2 + y2? 16x + y< 2
A. 
B. 
C. 
D. 
In the figure, m
= 90° and m
= 27°. Find the length of b correct to nearest tenth of a unit.
A. 9.8 B. 10.7 C. 10.9 D. 11.2
Solve the problem.Doctors predict that by administering a vaccine, the number of new cases of a certain disease will decrease by half each year. If 900 people were afflicted with the disease in 2000, estimate the number of new cases in 2005. (Round to the nearest whole number, if necessary.)
A. 28 new cases in 2005 B. 113 new cases in 2005 C. 14 new cases in 2005 D. 56 new cases in 2005
Solve using the elimination method. x - 5y = 20 9x - 4y = 16
A. (20, 16) B. (1, -5) C. (4, 0) D. (0, -4)