Use the given graph to find the x-intercepts and zeros of the function.
A. (3, 0), (1, 0); 3, 1
B. (-1, 0), (3, 0); -1, 3
C. (-3, 0), (1, 0); -3, 1
D. (-3, 0), (-1, 0); -3, -1
Answer: C
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Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. no solution; ? B. {(0, 0)} C. {(-1, 1)} D. {(-1, -1)}
On the Richter scale, the magnitude R of an earthquake is given by the formula 
where I is the intensity of the earthquake being measured and I0 is the standard reference intensity.
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What is the magnitude of an earthquake that has intensity 10 millions times that of I0?
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R = __________
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Suppose an earthquake is measured with a magnitude of 5 on the Richter scale with an error of at most 2%. Use differentials to find the error in the intensity of the earthquake.
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Hint: Observe that 
and use logarithmic differentiation. Round your answer to the nearest integer.
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__________I0
What will be an ideal response?
Solve.$50 is 20% of how much?
A. $1,000 B. $40 C. $250 D. $10
Solve the problem.The stadium vending company finds that sales of hot dogs average 31,000 hot dogs per game when the hot dogs sell for $2.50 each. For each 50 cent increase in the price, the sales per game drop by 5000 hot dogs. What price per hot dog should the vending company charge to realize the maximum revenue?
A. $3.10 B. $3.05 C. $0.60 D. $2.80