Answer:
10.5+0.75x=20
X=12
Step-by-step explanation:
They can watch about 12 movies, 20 subtracted by 10.5 is 9.5, they have 9.5 dollars remaining to spend on movies, divide 9.5 by 0.75 to get 12.666, but they cant watch a half a movie together so round to 12. 0.75(12)=9