Solve the problem.Devon purchased tickets to an air show for 8 adults and 2 children. The total cost was 
. The cost of a child's ticket was 
less than the cost of an adult's ticket. Find the price of an adult's ticket and a child's ticket.
A. adult's ticket: $23; child's ticket: $20
B. adult's ticket: $22; child's ticket: $19
C. adult's ticket: $20; child's ticket: $17
D. adult's ticket: $21; child's ticket: $18
Answer: D
Mathematics
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Simplify the expression. Write the result using positive exponents only.2-1 + 6-1
A. 
B. 2
C. - 
D. 
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Translate the phrase; then simplify.Find the product of -4 and -20.
A. 76 B. -80 C. 80 D. -76
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Solve.One pound of body weight is lost whenever 3500 calories are burned off. While jogging, Ari burns 400 calories per hour. How long must he jog at this rate to lose 1 pound? Give your answer to the nearest tenth of an hour.
A. 0.1 hr B. 8.8 hr C. 23.3 hr D. 7.5 hr
Mathematics
Solve the equation.28y = 20.72
A. 0.074 B. 0.74 C. 7.4 D. 7.28
Mathematics