Final answer:
To find out how long before the movie starts, subtract the current time from the movie start time. The answer is 25 minutes.
Step-by-step explanation:
To find out how long before the movie starts, we need to subtract the current time from the movie start time. The movie starts at 7:10 and it is now quarter to seven, which is 6:45. To subtract these times, we subtract the minutes and then the hours. For the minutes, we have 45 minutes - 10 minutes = 35 minutes. For the hours, since there is no carrying over from the minutes, we have 6 hours - 7 hours = -1 hour.
However, we can carry over the -1 to the minutes, so we have 60 minutes - 35 minutes = 25 minutes. Therefore, there are 25 minutes left before the movie starts.