1. Sam is challenging himself to improve the length of time (in seconds) he can hold a wall-sit. Sam held each wall-sit until failure (meaning he could not hold it any longer). The table shows the time for each day. Wall-sit Day 1 50 day 2 55 Day 3 57 Day 4 57 Day 5 52 Day 6 60 Day 7 65 Day 8 84 Day 9 69 Day 10 70 Sam claims his percent increase is 40%. Do you agree or disagree? Support your decision.​