Find the equation of the least-squares regression line. Graph the line and data points on the same graph.Managers rate employees according to job performance and attitude. The results for several randomly selected employees are given below.
A. y = -47.3 + 2.02x
B. y = 92.3 - 0.669x
C. y = 2.81 + 1.35x
D. y = 11.7 + 1.02x
Answer: D
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Solve the problem.For a particular circuit, the current (in amperes) after time t (in seconds) at a certain point P is given by 
Find the charge (in coulombs) that passes point P during the first second by evaluating 
A. 0.0039 C B. 1.28 C C. 0.005 C D. 256 C
Solve the problem.Suppose a car rental company charges $108 for the first day and $58 for each additional or partial day. Let S(x) represent the cost of renting a car for x days. Find the value of S(3.5).
A. $203 B. $253 C. $282 D. $311
Solve the problem.Older bridges with the potential for structural failure make up 20% of all the bridges in America. If there are about 7714 such bridges, find the approximate total number of bridges. Round to the nearest whole number.
A. 154,280 bridges B. 1543 bridges C. 386 bridges D. 38,570 bridges
Estimate the sum as indicated. Then answer the question.Estimate the following sum by first rounding to the nearest hundred. Does the estimate give you reason to doubt the stated sum?
A. Estimate: 12,600 ; yes B. Estimate: 12,900 ; no C. Estimate: 12,600 ; no D. Estimate: 12,900 ; yes