Final answer:
Part A: The division sentence is 76 ÷ 8 = 9. Part B: It will take Oliver 9 weeks to complete the scarf. After 9 weeks, he will still have 4 rows left to knit.
Step-by-step explanation:
Part A of the problem asks for the division sentence that the drawing shows. The array in the drawing represents the number of rows in the scarf divided by the number of rows Oliver plans to knit each week. So, the correct division sentence is 76 ÷ 8 = 9.
For Part B, Oliver plans to knit 8 rows each week. To determine how long it will take for him to complete the scarf, we can divide the total number of rows (76) by the number of rows he knits each week (8). The result is 9. So, it will take Oliver 9 weeks to complete the scarf.
After knitting for 9 weeks, Oliver will have knitted a total of 9 x 8 = 72 rows. To find out how many rows he will still have to knit, we can subtract this from the total number of rows in the scarf. 76 - 72 = 4. Therefore, after 9 weeks, Oliver will still have 4 rows left to knit.