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. An insurance company is willing to insure the concert for $150,000 against rain for a premium of $30,000. If he buys this policy, what are his expected earnings from the concert?
A. $180,000
B. $300,000
C. $270,000
D. $239,400
Answer: D
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Solve.An electrical circuit contains two resistors connected in parallel. If the resistance of each is R1 and R2 ohms, respectively, then their combined resistance R is given the formula R = If their combined resistance R is 3 ohms and R2 is 9 ohms, find R1.
A. ohms
B. 6 ohms
C. ohms
D. ohm
Write the expression in standard form.(4 - 9i) + (4 + 5i)
A. -8 + 14i B. 8 + 4i C. -8 + 4i D. 8 - 4i
Determine the domain and the range of the function.f(x) = x2 - 2x - 8
A. domain: {x|x ? -1} range: {y|y ? -9} B. domain: all real numbers range: {y|y ? -9} C. domain: all real numbers range: all real numbers D. domain: all real numbers range: {y|y ? 9}
Find the number of subsets of the set.{1, 2, 3, . . . , 7}
A. 124 B. 256 C. 128 D. 16