Three students attempt to define the geometric object called an angle. can you match the teacher's comments to the definitions?

Ineed with number 17 i don’t get it at alll

Find the slope of the line y =8/9x + 1.

(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.