Question

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.

Answer 1

What did you find when you made the table?

Answer 2

Jump Number
Position After jump forward
Position after Step Back

Answer 3

I don't have any idea.

Answer 4

Good.

According to your table, on which jump will she reach 20 feet?

Answer 5

After 7 jumps foward and 6 backward.

Answer 6

Jump 1: 0 +5 -2 = + 3
Jump 2: 3 + 5 - 2 = +6

Answer 7

Thanks. Now I understand.

Answer 8

You're welcome.

Great! :-)