A circular swimming pool has a radius of 15 feet. What is the circumference of the pool?

Which of the following is not a subset of {1,2,3}?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

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