Express… As a limit of a right Reimann sum

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

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

What is 1.5% of 120 or what number is 1.5% of 120