Solve the non-homogeneous differential equation y′′+9y=sec^(2)(3x) on the interval −π/6

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

3women sell hats at a craft fair weekly. the money they make at the fair is split into categories. 9% goes to pay taxes. $55 goes to pay rent for the space they sell in. the rest is split between the women. if the group make $706 at the fair, how much does each women get paid once the money is divided