F(x)=x^2+1 What is f(f(x))?

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4

Arandom sample of size n 64 is taken from a population with population proportion p 0.38 describe the sampling distribution of p. draw a graph of this probability distribution with its a. mean and standard deviation. b. what is the probability that the sample proportion is greater than 0.5? what is the probability that the sample proportion is less than 0.3? d. what is the probability that the sample proportion is between 0.35 and 0.45?

First to answer will be the brainliest i need the answer asap