Will give branliest find the value of each trigonometric radio.

Me find the measure to side a and the process to solve the problem you appreciate it : )

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"