100% - 5% = 95%
Multiply time by 95% raised to the number of times he will mow:
90 minutes x 0.95^10 = 53.88 minutes (round answer as needed)
Answer:
See below
Step-by-step explanation:
Each time he mows is 95% of the previous time ...the first time is 90 minutes, then mow nine more times ...
90 ( .95)^9 = 56.72 minutes
