Final answer:
The expression to show the total numbers of hours Erica works each week is 5 + x.
Step-by-step explanation:
The expression to show the total numbers of hours Erica works each week is 5 + x.
Since Erica always tutors for 5 hours each week, this is represented by the constant term 5 in the expression. The variable x represents the hours that Erica babysits, so the expression is 5 plus the number of babysitting hours.