List the possible rational roots and actual rational roots for the equation x^3-2x^2+x+18=0

(a) compute the maclaurin polynomial m2(x) for f(x) = cos x. (b) use the polynomial of part (a) to estimate cos π 12. (c) use a calculator to compute the error made using the estimate from part (b) for the value of cos π 12. remember that the error is defined to be the absolute value of the difference between the true value and the estimate.

Which statement best describes the polynomial

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)