What is the sum of the series?

3∑k=1(5k2−1)

(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.

What are the solutions to the equation 4x2+3x=24-x

What point is the projection of q on a) r b) s c) t