Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. What are Mr. Cameron's expected concert earning?
A. $300,000
B. $360,000
C. $60,000
D. $218,400
Answer: D
Mathematics
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Solve the problem.During a drought, the water level in a river dropped 3 inches each day for 4 straight days. What was the change in the water level of the river during this period?
A. -12 in. B. 12 in. C. -7 in. D. 7 in.
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Use Cramer's rule to solve the system of linear equations.0.4x + 0.7y = -4 x - 0.7y = -0.2
A. No Solution B. (-0.3, -0.4) C. (-3, -4) D. (-4, -3)
Mathematics
Graph the function.y = |x - 7| - 5
A. 
B. 
C. 
D. 
Mathematics
Solve using the substitution method. Use a graphing calculator to check your answer. x + 5y = 44y = -22 + 2x
A. (-10, 14)
B. (14, 6)
C.
| No solution |
D. Infinitely many solutions
Mathematics