Hello!
First of all, let's rewrite some important information contained in the exercise.
We know that Joelle earns:
• $10.00 per week doing chores.
,• $2.50 per week taking the mail inside.
Knowing it, we can write it as an algebraic expression (considering the number of weeks = w).
She will earn:
[tex](10.00\cdot w)+(2.50\cdot w)=(12.50\cdot w)[/tex]As we know the number of weeks is 25, we will have w = 25.
So, we have to multiply the amount that she earns each week by the number of weeks, look:
[tex]\begin{gathered} 12.50\cdot w \\ 12.50\cdot25 \\ =\boxed{312.50} \end{gathered}[/tex]Joelle will earn $312.50 over 25 weeks.
