Can someone help me with this please?

Use set buikder notation to represent the following set: {, -2, -1, 0}

Bring the fraction a/a-4 to a denominator of 16-a^2

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.