Find the numerical value of the log expression

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

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