posted by PLEASEEEE on .
At football practice, players do a 20-minute warm-up before starting their practice drills. After the practice drills, they do a 10-minute cool-down. The expression 20+d+10 describes the length of practice, where d is the number of minutes the practice drills last. How long, in minutes, does practice last if 30 minutes are spent on practice drills.
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
See your previous post.