I need help and i need the work shown.

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

Asinusoidal function whose frequency is 1/6pi

F. a fair coin is thrown in the air four times. if the coin lands with the head up on the first three tosses, what is the probability that the coin will land with the head up on the fourth toss? a. 0 b. 1/16 c. 1/8 d. 1/2