Which relation is a function?

Suppose that g(x)=f(x+9) which statement best compares the graph of g(x) with the graph of f(x)

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.

Suppose medical records indicate that the length of newborn babies (in inches) is normally distributed with a mean of 20 and a standard deviation of 2.6. find the probability that a given infant is between 14.8 and 25.2 inches long.