How do you solve these questions?

1. solve tan²θ = tanθ

2. find the following and express your answer in polar form.
(2 - j)(cos45° + j sin45°)

Acompany is making new soccer uniforms for a team. the company uses 2.5 yards of fabric for each shirt. the company uses 82.5 yards of fabric to make shirts and shorts for 15 players. the equation and solution below represents the situation. 15(2.5+x)=82.5; x=3 what does the solution, x=3, represent?

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 12

The square root of 9x plus 7 plus the square rot of 2x equall to 7