Solve the problem.The graph models the monthly average temperature y in degrees Fahrenheit for a city in the United States, where x is the month.
Find and interpret the amplitude.
A. The amplitude is 28 and represents the temperature range.
B. The amplitude is 59 and represents the midpoint of the monthly average temperatures.
C. The amplitude is 28 and represents half of the temperature range.
D. The amplitude is 56 and represents half of the temperature range.
Answer: C
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Solve the system using the graphing method. -3x - 3y = -6 18x + 18y = 36 
A. {(6, 6)}
B. {(-6, -6)}
C. Infinite number of solutions
D. ?
Solve the problem.One pump can drain a pool in 11 minutes. When a second pump is also used, the pool only takes 7 minutes to drain. How long would it take the second pump working alone to drain the pool? (Round your answer to the nearest tenth, if necessary.)
A. 4.3 min B. 73 min C. 20.5 min D. 19.3 min
Solve the equation.(x - 2)(x + 4) = 0
A. {-2, 4} B. {2, 4} C. {2, -4} D. {2, -2, 4, -4}
Solve the initial-value problem.
