You save $500 in a retirement account at age 25. is increased an average of 10% per year until you are 65. which formula and result indicates how much money you will have in this account at age 65

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