Hi guys help me on this it’s math :((:))?

100 points? me its important ‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️

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

If the perimeter of the garden is 37 ft. the width is x and the length is 15 ft. what is the width of the garden in feet?