.Answer: C
Step-by-step explanation:
4.5+p would be the full length of 18 since it is sharing the total length.





//
If the 3 is an exponent, then the person above me is right.
Answer:

unit rate is similar to speed / velocity:

[<em>unit</em><em> </em><em>rate</em><em> </em><em>must</em><em> </em><em>have</em><em> </em><em>units</em><em> </em><em>including</em><em> </em><em>per</em><em> </em><em><</em><em>time</em><em>></em><em> </em>]