Solve the problem.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). Use the equation of the least squares line to predict the number of products sold if the cost of advertising is $7000. 
A. 72.33 products sold
B. 75.33 products sold
C. 82.03 products sold
D. 19,585.8 products sold
Answer: B
Mathematics
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For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (4t sin t + 4 cos t)i + (4t cos t - 4 sin t)j + 8k; normal plane at t = 5.5?.
A. x - y + z = -4 B. y = -4 C. x + y + z = -4 D. y = 4
Mathematics
Solve the problem.Jarod calculated the speed of a train to be 30 feet per second. Calculate the speed in miles per hour.
A. 23 mi./hr. B. 20 mi./hr. C. 16 mi./hr. D. 17 mi./hr.
Mathematics
Evaluate the function.The graph of y = f(x) is shown below. Find f(-1)
A. -3 B. 5 C. 3 D. 7
Mathematics
Perform the indicated operation.7z - (17 - 4z)
A. 3z + 17 B. 3z - 17 C. 11z + 17 D. 11z - 17
Mathematics