Find a power series solution of the differential equation y" +x^2 y'=0 about the ordinary point x =0.

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)