Plz help! the length of a rectangular sandbox is 3x+5. the width of the sandbox is x-3

a. What polynomial in standard form represents the area of the sandbox

b. Name the polynomial based on its degree and number of terms

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