Let pn(f) be a set of polynomials of degree at most n。show that pn(r) is an inner product space with the evaluation inner product defined.
hint: a non-zero polynomial of degree at most n has at most n distinct root

Could somebody me with this radical simplification?

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

What is the correct answer? urgent you