Final answer:
After 5 weeks, Carlos would have $140 saved up. The expression representing his total savings after 'w' weeks is '100 + 8w'.
Step-by-step explanation:
Carlos has already saved $100 and is saving an additional $8 per week. After 5 weeks of saving, he would have saved:
$100 (initial amount) + $8/week × 5 weeks = $100 + $40 = $140
So, Carlos would have a total of $140 after 5 weeks.
The expression to represent the amount of money Carlos would have saved after w weeks is:
100 + 8w
Where w represents the number of weeks Carlos has been saving.