Solve the problem.Chris and Mary are selling tickets at their class play. Chris is selling student tickets for $1.00 each, and Mary selling adult tickets for $6.50 each. If their total income for 26 tickets was $64.50, how many tickets did Chris sell?
A. 19 tickets
B. 21 tickets
C. 12 tickets
D. 7 tickets
Answer: A
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Solve the problem.A heat engine is a device that converts thermal energy into other forms. The thermal efficiency, e, of a heat engine is defined by 
where Qh is the heat absorbed in one cycle and Qc, the heat released into a reservoir in one cycle, is a constant. Find 
.
A. 
= 
B. 
= - 
C. 
= Qh - Qc
D. 
= 
Solve the problem.Tom Quig traveled 200 miles east of St. Louis. For most of the trip he averaged 60 mph, but for one period of time he was slowed to 20 mph due to a major accident. If the total time of travel was 6 hours, how many miles did he drive at the reduced speed?
A. 75 miles B. 100 miles C. 80 miles D. 90 miles
Solve the following equation by finding the exact solution.
?
?
A. 
B. 
C. 
D. 
E. 
Convert the units.2.3 L = 
mL
A. 0.0023 mL B. 230 mL C. 0.23 mL D. 2300 mL