Write and solve an equation to find the percent increase or decrease. Round your answer to the nearest tenth of a percent, if necessary.Enrollment in a business seminar increased from 66 people to 81 people. What was the percent of increase?
A.
| 18.5% |
B.
| 81.5% |
C. 22.7%
D.
| 77.3% |
Answer: C
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Solve.A train traveled m mi at a speed of s mph. A bus following the same route traveled 4 mph slower. How much longer did the bus take than the train to make this trip? Write the answer as a single rational expression.
A. 
hr
B. 
hr
C. 
hr
D. 
hr
Solve the problem.Two friends decide to meet in Chicago to attend a Cub's baseball game. Rob travels 
in the same time that Carl travels 
Rob's trip uses more interstate highways and he can average 
more than Carl. What is Rob's average speed?
A. 58 mph B. 63 mph C. 53 mph D. 54 mph
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where H+ represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 
A. 8 B. -8 C. 6 D. -6
Write an inequality involving absolute value that describes the graph shown.
A. 
< 2
B. 
> 2
C. 
> -6
D. 
> 2