Can someone me with this question?

its either one of them or both of them

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

(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.

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8