Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard deviation σ=15. Find the probability that a randomly selected adult has an IQ between 87 and 123 .

Part a: area of a rectangle is length x width
                (4x + 5)(3x + 10)
                use foil to multiply the equation.
                first outer inner last
     
first, multiply 4x x 3x = 12x^2
outer, multiply 4x x 10 = 40x
inner, multiply 5 x 3x = 15x
last, 5 x 10 = 50

12x^2 + 40x + 15x + 50
12x^2 + 55x + 50

part b: the degree is 2, because 12x^2 has an exponent of 2.

part c: the product of 2 polynomials, is a polynomial.