Hi! An equation can be made for this situation. She had 4 projects and worked x amount of hours which we don't know. Adding on to that she worked for 2 more hours on language arts. The equation would be: 4x+2=16. If we solve it like a normal equation:
4x+2=16
4x=14
if we divide both sides by 4 to isolate x:
x=3.5
She worked 3.5 hours per project