Aturtle is at the bottom of a 14 foot well. each day it crawls up 5 feet, but each night it slips back 4 feet. after how many days will the turtle reach the top of the well.

Day         Height
0              -14
1              -13
2              -12
3              -11
4              -10
5              -9
6              -8
7              -7
8              -6
9              -5
10            -4
11            -3
12            -2
13            -1
14             0

It will take him 14 days

Every day he crawls up +5 then at night down -4.
5-4 = 1
So, at the end of every day he goes up 1 foot.

J= r + 9 because since jessica rode 9 more miles than roger, you add 9 miles to rogers mileage.