### Home > MC1 > Chapter 2 > Lesson 2.2.2 > Problem2-69

2-69.

Here are some new distances with given lengths to help Cecil cross the tightrope, introduced in problem 2-50. Find at least two ways to get Cecil across. Write your solutions using numbers and symbols.

1. Span of tightrope: $21$ feet
Given lengths: $3,5,8$ feet

This problem is very similar to 2-55 on page 88 of your textbook. Use the solution to that problem to guide you, if you need help.

Is $21$ a multiple of $3,5,$ or $8$? If so, try adding that to itself to get to $21$.
That is a good starting place for the rest of the problem.

2. Span of tightrope: $12$ feet
Given lengths: $4,7,9$ feet

See part (a) for help.

One possible solution is $7+9+(−4)$.

3. Span of tightrope: $16$ feet
Given lengths: $3,5,7$ feet

See part (a) for help.