Regroup tens as hundreds

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Which statements regarding efg are true? check all that apply.

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