What is an equation in point-siope form of the line that passes through (-7, 1) and (-3, 9) ??

How do i work this problem out using the equation a=pe^rt

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

Ihave trouble finding the nth term of a linear sequence