How do you change 0.81 into a fraction

(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.

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?