A crafter is preparing 10 art projects. Each project will use either acrylic paints or watercolor paints, but not both. Acrylic paint projects require 12 milliliters of paint, and watercolor paint projects require 5 milliliters of paint. If is the number of projects that will use acrylic paints and the remaining projects will use watercolor paints, which of the following expressions represents the total number of milliliters of paint required?
10x
17x
7x + 50
17x + 50