a house painter uses 0.7 gallons of paint for a wall that is 140 square feet. How much paint in gallons does she need to be able to cover 1900 square feet

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