Simplify radical 150 =

How do i do this activity, is appreciated

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total