Math
posted by Haley on .
Barbara is playing a game. She jumps forward 5 feet, and then steps backward 2 feet. How many jumps will it take her to reach the finish line, which is 20 feet from where she started?
Make a table to show Barbara's position.
Barbara will reach 20 feet on jump number _____?
It will take Barbara ______ jumps forward before she passes the finish line.

What did you find when you made the table?

Jump Number
Position After jump forward
Position after Step Back 
I don't have any idea.

Good.
According to your table, on which jump will she reach 20 feet? 
After 7 jumps foward and 6 backward.

Jump 1: 0 +5 2 = + 3
Jump 2: 3 + 5  2 = +6 
Thanks. Now I understand.

You're welcome.
Great! :)