Solve the problem involving modeling with polynomial functions.The bar graph shows the number of personal checks written (in millions) during the years 1981 (x = 1), through 1987 (x = 7). 
(a) Use the polynomial-fitting capability of a calculator to determine a quadratic function that best fits these data.(b) Repeat part (a) for a cubic function.
A. (a) y ? -1.86
x3 + 21.5x2 - 130.353175x + 743.857143
(b) y ? 3.049242x4 - 50.648989x3 + 285.041667x2 - 677.474387x + 1088.857143
B. (a) y ? -0.8
x2 - 54.047619x + 676.857143;
(b) y ? -1.86
x3 + 21.5x2 - 130.353175x + 743.857143
C. (a) y ? -0.8
x2 - 55.714286x + 621.976190;
(b) y ? -1.86
x3 + 15.91
x2 - 92.936508x + 633.1428571
D. (a) y ? -0.8
x2 - 55.714286x + 621.976190;
(b) y ? - 50.648989x3 + 285.041667x2 - 677.474387x + 1088.857143
Answer: B
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Find the second derivative of the function.y = 
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Solve for x: 4 + 9x = 40
a. x = 5.0 b. x = 6.0 c. x = 4.0 d. x = 44 e. x = 36
Provide an appropriate response. Solve the following using a constant of variation:How much fertilizer does 3,246 square feet of lawn need if the fertilizer treats 1,500 square feet per gallon? Express to nearest tenth.
A. 0.5 gal B. 1.7 gal C. 5.7 gal D. 2.2 gal
Solve the problem.The population of a city has varied considerably in recent years. The data in the table relates the population P to time t, in years. Use a quadratic function fitted to the data to predict the population in year 10. 
A. 119,000 B. 58,964 C. 48,431 D. 81,202