What ordered pair corresponds to the vertex of the function

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

The sum of five and a number n is at least 12