Help me please, 1. And 2.

(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.

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?