Solve the system by substitution. If the system is inconsistent or dependent, say so.
A. (3, 5)
B. (-5, 3)
C. (-7, 3)
D. (5, 3)
Answer: D
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Rewrite the following as a product of trigonometric functions.sin 
+ sin 
A. 2 sin 
sin 
B. 2 cos 
cos 
C. 2 cos 
sin 
D. 2 sin 
cos 
Decide whether or not the ordered pair is a solution of the system.(-6, -1)4x + y = -233x + 4y = -14
A. Yes B. No
Solve the problem.Before exercising, an athlete measures her air flow and obtains a = 0.65 sin 
where a is measured in liters per second and t is the time in seconds. If a > 0, the athlete is inhaling; if a < 0, the athlete is exhaling. The time to complete one complete inhalation/exhalation sequence is a respiratory cycle. What is the amplitude? What is the period? What is the respiratory cycle? Graph a over two periods beginning at t = 0. 
What will be an ideal response?
Solve.
x = 18
A. 20
B. 
C. 
D. 