Find all the roots of the function. Use preliminary analysis and graphing to determine good initial approximations. Round to six decimal places.f(x) = cos 2x - 
+ 3
A. x ? -2.579947, 2.801947
B. x ? -2.690947, 2.690947
C. x ? -2.801947, 2.579947
D. x ? -4.190947, 1.190947
Answer: B
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Calculate the derivative of the function. Then find the value of the derivative as specified.f(x) = 
; f '(-1)
A. f '(x) = - 
; f '(-1) = -8
B. f '(x) = 
; f '(-1) = 8
C. f '(x) = 8; f '(-1) = 8
D. f '(x) = - 8x2; f '(-1) = - 8
Convert as indicated. If necessary, round to the nearest tenth of a degree.The temperature recorded on a thermometer was 28°C. Find the corresponding temperature in degrees Fahrenheit.
A. 47.6°F B. -16.4°F C. 18.4°F D. 82.4°F
Determine independence. Answer Yes or No.The table shows the political affiliation of voters in one city and their positions on stronger gun control laws. ?Stronger Gun Control 
Are party affiliation and position on gun control laws independent?
A. Yes B. No
Evaluate the required second order partial derivative.Find fxy(2, 5), if f(x, y) = (x - 2) ln(xy2).
A. 0.4 B. -0.5 C. -1.5 D. 1