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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A. 20,475 B. 19,476 C. 21,000 D. 20,000
Express the given quantity in terms of sin x or cos x.sin 
A. cos x B. -cos x - sin x C. -cos (-x) D. -cos x
Write the number in scientific notation.A beam of light can travel from my house to yours in 600 nanoseconds. (the prefix nano means one billionth).
A. 6 × 10-9 B. -6 × 107 C. 6 × 10-7 D. 6 × 10-6
Solve the system of four equations in four unknowns using matrices. x + 3y - 2z - w = 16 4x + y + z + 2w = 10-3x - y - 3z - 2w = 1 x - y - 3z - 2w = 5
A. (0, 5, -9, 6) B. (-1, 3, -5, 6) C. (16, 10, 1, 5) D. (1, 3, -5, 4)