Help me please this is a math TEST if it is correct I will give you lots of points and if it's wrong well no points for you and I am rating it

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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.

How many solutions does the nonlinear system of equations graphed below have?