Found this one quite tricky, as it was my first "live" use of the predictive tools. Once I understood I had to use the Linear Regression tool, things fell into place.
Full honesty, I relied heavily on the posted solution to help work through this one. I don't understand why the value on the output of my score tool has a bunch of numbers after the decimal, but the posted solution is nice integers. I can't figure out where I missed that in the config.