Final answer:
To find how many portraits Luke can paint in 4 weeks, divide the total portraits by 7 to get the weekly rate, then multiply by 4. Luke can paint 52 portraits in 4 weeks.
Step-by-step explanation:
To determine how many portraits Luke can paint in 4 weeks, we first need to calculate the number of portraits he paints per week. Since Luke can paint 91 portraits in 7 weeks, we divide the total number of portraits by the number of weeks to find the weekly rate.
Weekly rate = Total portraits ÷ Number of weeks = 91 portraits ÷ 7 weeks = 13 portraits per week.
Next, we multiply the weekly rate by the number of weeks in question to find out how many portraits Luke can paint in 4 weeks.
Portraits in 4 weeks = Weekly rate × Number of weeks = 13 portraits per week × 4 weeks = 52 portraits.
Therefore, the answer is A) 52 portraits.