The expression \( p + 4p \) can be combined to give \( 5p \) (since \( p + 4p = 5p \)).
Among the options you've provided, the correct answer is:
5p
This expression represents the total number of problems Vicki and Tamra have worked together, where Vicki worked \( p \) problems and Tamra worked \( 4p \) problems.