A student solved for the radius of a circle with a circumference of 12π. In which step did the student make an error?

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

What is the product? a-3/15a × 5/a-3

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