Carrie is given a plant. after one week, it grows to 7/8 foot tall, and after two weeks i grows to 1 1/2feet tall. if it keeps growing a the same pace, how tall will it be after 3 weeks?

7/8 first week
3/2 second week = 12/8 total

12/8 - 7/8 = 5/8 second week

7/8 first, 5/8 second, therefor 3/8 for the third week.

3/2 + 3/8 = total in third week
12/8 + 3/8 = 15/8 = 1 7/8 total in third week

We need more info then that