3n + 6 = 18. What is the value of n

Mary had at least an 80% on her test write an inequality to represent this situation

(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.

Taking algebra two apex courses and need with these questions