Jessica rewrites expression 1 as d + d + d + 5 + 5 + 5.
why might she have done this?

she wrote it to make it simpler to add.

Step by step:

A triangle has 3 sides. It's given sides are d+5. All sides are d+5 because it is an equilateral triangle.

The answer to the question you were looking for is: SHE COMBINED THE LIKE TERMS SO IT WOULD BE EASY TO ADD THEM.

Hope it helps

after going and makeing graphs i would go with a,

there is nothing that is matches the graph. if there was i would show you. but therefore my answer is a.

hope i

-lavira: )