Solve the problem.The profit made when t units are sold, t > 0, is given by  Determine the number of units to be sold in order for P > 0 (a profit is made).

A. t = 20 or t = 18
B. t = 38
C. t > 20 or t < 18
D. 20 < t < 18


Answer: C

Mathematics

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Provide an appropriate response.Simplify: 

A. 2y5
B. 2y5
C. 2
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Use the figure to answer the question.The weights (in pounds) of a group of high school students are listed below in a  plot.Which interval has the most students in it?

A. 140-149 B. 90-99 C. 130-139 D. 110-119

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Solve the problem.The voltage E in an electrical circuit is given by E = 6.4 cos 110?t, where t is time measured in seconds. Find the period.

A.
B. 55
C.
D. 55?

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Use elimination to determine whether the system of equations has no solutions, one solution, or infinitely many solutions.4x + 5y = -3-20x - 25y = 15

A. No solutions B. One C. Infinitely many

Mathematics