PLEASE HELP ASAP
Explain the diagram.

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

Measures of the angle of r, 31 s (x+4) t (3x+9)

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.