Evaluate.log7 49
A. 14
B. 7
C. 49
D. 2
Answer: D
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Solve the problem.Find the mass of a wire of density ?(x, y, z) = 4z and has the shape of the helix 
y = 3 sin t, z = 4t
A. 40?2
B. 80?2
C. 8?2
D. 
?2
Write a word description of the set.{40, 42, 44, 46, ..., 100}
A. all even numbers B. odd numbers from 40 to 100 C. even numbers from 40 to 100 D. numbers from 40 to 100
Find the real solutions, if any, of the equation. Use the quadratic formula.3x2 + 7x - 20 = 0
A. {
, 4}
B. {- 
, 4}
C. {
, -4}
D. {- 
, -4}
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