Why is a parallelogram not the same type of quadrilateral as a trapezoid?

What is the square root of 45? (step by step working plz)

(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.

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.