Use a graphing calculator to plot the data and find the quadratic function of best fit.A small manufacturing firm collected the following data on advertising expenditures (in thousands of dollars) and total revenue (in thousands of dollars). 
Find the quadratic function of best fit.
A. R(x) = -0.015x2 + 4.53x + 6123
B. R(x) = -0.024x2 + 7.13x + 6209
C. R(x) = -0.31x2 + 2.63x + 6128
D. R(x) = -0.091x2 + 5.95x + 6337
Answer: D
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Combine like terms when possible. 3x6 + 6x6 - 5x6
A. 4x18 B. -90x6 C. 4x6 D. cannot be simplified
Find f.
(t) = 2t ? 4sint, f(0) = 5
Select the correct answer.
a. f(t) = 
? 3cost ? 5
b. f(t) = + 4cost + 1
c. f(t) = 2t ? 3sint + 5
d. f(t) = + 3cost
e. None of these
Solve the problem.Use the formula N = Iekt, where N is the number of items in terms of the initial population I, at time t, and k is the growth constant equal to the percent of growth per unit of time. An artifact is discovered at a certain site. If it has 47% of the carbon-14 it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.0125% annually.)
A. 2623 years B. 4240 years C. 6040 years D. 3760 years
Find the equation of the line that passes through the two given points. If possible, write your equation in slope-intercept form.(-9, -57) and (7, 39)
A. y = - 
x - 
B. y = -6x - 111
C. y = 
x - 
D. y = 6x - 3