CPM Homework Help : CCA2 Problem 9-39

What is the probability that $x^2 + 7x + k$ is factorable if $0 ≤ k ≤ 20$ and $k$ is an integer?

Hint:

How many possible values are there for $k$ ? This is the denominator of the probability.

More Help:

What numbers between $0$ and $20$ starting with $1$ and going to $20$ have two factors that add to $7$ ? Note: $0$ works because $x$ would be a factor.

More Help 2:

$\frac{\text{Number of }k\text{s that work}}{\text{All possible }k\text{s}}$