Solve.By switching service providers, a family's telephone bill decreased from about $50 a month to about $43. What was the percent of decrease?
A. 14%
B. 16.3%
C.
| 7% |
D. 15%
Answer: A
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Solve the problem that involves probabilities with dependent events. Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability that both marbles are white.
A. 
B. 
C. 
D. 
Translate the ellipse with the given equation so that it is centered at the given point. Find the new equation and sketch its graph.
+ 
= 1; (3,1)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ = 1
D. 
+ 
= 1
A truck gets 600/x mpg when driven at a constant speed of x mph (between 40 and 80 mph). If the price of fuel is $1/gallon and the driver is paid $8/hour, at what speed between 40 and 80 mph is it most economical to drive? ?
A. 60 mph B. 80 mph C. 75 mph D. 40 mph E. 45 mph
Solve the linear inequality. Express the solution in set-builder notation.-9x + 9 > -10x + 11
A. {x|x < 2} B. {x|x < 20} C. {x|x > 20} D. {x|x > 2}