Use the x-intercepts to find the intervals on which the graph of f is above and below the x-axis.f(x) = 
2(x - 2)3
A. above the x-axis: 
, 
below the x-axis: (2, ?)
B. above the x-axis: 
, (2, ?)
below the x-axis: 
C. above the x-axis: 
below the x-axis: 
, (2, ?)
D. above the x-axis: (2, ?)
below the x-axis: 
, 
Answer: D
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Rationalize the denominator. Assume that all variables represent positive real numbers and that the denominator is not zero.
A. 
B. 
C. 
D. 
Provide an appropriate response.Why is an exponential function one-to-one?
What will be an ideal response?
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
Find all of the real zeros of the function. Give exact values whenever possible. Identify each zero as rational or irrational.f(x) = x4 - 2x3 - 21x2 + 12x + 90
A. -3 (rational), 5 (rational), 2 + 
(irrational), and 2 - 
(irrational)
B. 3 (rational), -5 (rational), 2 + 
(irrational), and 2 - 
(irrational)
C. 3 (rational), -5 (rational), 
(irrational), and -
(irrational)
D. -3 (rational), 5 (rational), 
(irrational), and -
(irrational)