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
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Suppose that a certain radioactive substance has a half-life of 45 years. If there are presently 1,920 milligrams of the substance, how much, to the nearest milligram, will remain after 180 years?
A. Q = 130 milligram B. Q = 120 milligram C. Q = 135 milligram D. Q = 95 milligram E. Q = 125 milligram
Decide whether the pair of lines is parallel, perpendicular, or neither.The line through (-12, 5) and (-4, 7) and the line through 
and 
A. Parallel B. Neither C. Perpendicular
Solve.27 = 6 + x
A. 11 B. 31 C. 27 D. 21
Solve the problem by using a nonlinear system.The sum of the squares of the digits of a positive two-digit number is 85, and the tens digit is 1 less than the units digit. Find the number.
A. 56 B. 67 C. 65 D. 76