Find all solutions of the equations in the interval [0,2pi].
1. tan^(2) x + tan x = 0
2. sin 2 a - cos a = 0
3. 4 cos^(2) x - 3 = 0
4. csc^(2) x - csc x - 2 = 0

Harry’s soccer team plays 2 nonconference games for every 3 games that they play against conference opponents. if y represents the number of nonconference games and x represents the number of conference games, which equation best models this proportional relationship? a)y=2/3 x b)y=3/2 x c)y = 2x d)y = 6x

Yesterday i ran 5 miles. today, i ran 3.7 miles. did my percent increase, decrease or is it a percent error? plz i need

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years