Let's first analyze the situation:
- Vicki has worked p problems.
- Tamra has worked 3 times as many problems as Vicki, which means she has worked 3p problems.
To find the total number of problems they have worked together, we add Vicki's problems and Tamra's problems:
Total problems = Vicki's problems + Tamra's problems = p + 3p = 4p.
Now, let's evaluate the options:
A. p + 3 - This represents that Vicki and Tamra have worked on p + 3 problems altogether. This is incorrect since the total is actually 4p.
B. 4p - This represents that Vicki and Tamra have worked on 4p problems altogether. This is correct and matches our calculation.
C. p + 4 - This represents that Vicki and Tamra have worked on p + 4 problems altogether. This is incorrect since the total is 4p, not p + 4.
D. 4p² - This represents that Vicki and Tamra have worked on 4p² problems altogether. This is incorrect since the total is 4p, not 4p².
Based on this analysis, the correct option is B. 4p.