Could someone solve 12 and 13 for me

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.

What is the length of side s of the square shown below?