Will mark brainliest, find the missing side lengths. Leave your answers as radicals in simplest form.

Which diagram shows lines that must be parallel lines cut by transversal?

How do i i solve this equation? -18 = x/3 + 3

Norder to get a certain shade of blue paint, a mixer must have 5 parts white paint to 3 parts blue. if 4 gallons of paint must be mixed, how many gallons of white paint must be used?