SOLUTION: Akim runs 1.75 miles on his first day of training for a road race. The next day, he increases his distance run by 0.25 miles. The day after that, he increases his distance run by

Algebra ->  Sequences-and-series -> SOLUTION: Akim runs 1.75 miles on his first day of training for a road race. The next day, he increases his distance run by 0.25 miles. The day after that, he increases his distance run by      Log On


   



Question 1076576: Akim runs 1.75 miles on his first day of training for a road race. The next day, he increases his distance run by 0.25 miles. The day after that, he increases his distance run by another 0.25 miles, and so on.
What is the total number of miles Akim runs over the course of 18 days?
68.5 mi
69.75 mi
70.25 mi
72.5 mi

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
S18=(n/2)[2a1+(n-1)d]
=9[3.5+17(0.25)]=9*7.75=69.75 miles