Tristan spent $400 on the headphones and the sales tax was 6 | %. How much money did he spend total? How do I solve this

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

Find the equation of a line that is perpendicular to line g that contains (p, q). coordinate plane with line g that passes through the points negative 3 comma 6 and 0 comma 5 3x − y = 3p − q 3x + y = q − 3p x − y = p − q x + y = q − p

Find the maximum value of p= 4x + 5y subject to the following constraints :