Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 1
B. 
C. 
D. 
Answer: C
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Solve the problem.Devon purchased tickets to an air show for 7 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: $19; child's ticket: $15 B. adult's ticket: $22; child's ticket: $18 C. adult's ticket: $20; child's ticket: $16 D. adult's ticket: $21; child's ticket: $17
Solve the problem. Round your answer, if appropriate.Boyle's law states that if the temperature of a gas remains constant, then PV = c, where 
, 
, and c is a constant. Given a quantity of gas at constant temperature, if V is decreasing at a rate of 13 in. 3/sec, at what rate is P increasing when P = 70 lb/in.2 and V = 50 in.3? (Do not round your answer.)
A. 
lb/in.2 per sec
B. 
lb/in.2 per sec
C. 
lb/in.2 per sec
D. 
lb/in.2 per sec
Find a positive value of the given variable so that the trinomial is factorable.5x2 + bx + 1; b = ?
A. 4 B. 6 C. 7 D. 5
Solve the problem.For what values of x would the rectangle have a perimeter of at least 278? 2x + 1 
A. 29 or greater B. 14 or less C. 29 or less D. 14 or greater