The interest rate is approximately what percent

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

Why is x= 4 a solution to the proportion 14/x 56/1 6

Asandwich shop has 18 tables. each table seats up to 4 people. to find the greatest number of people that can be seated, you can solve p4 ≤ 18. which step is the best way to solve the inequality? plz asap i repeat plz