Final answer:
To find the height of Michael's plant on Monday, we need to calculate the total growth and subtract it from the height on Friday.
Step-by-step explanation:
To find out the height of Michael's plant on Monday, we can calculate the total growth from Monday to Friday and subtract it from the height on Friday.
From Monday to Wednesday, the plant grew by 3/8 foot. From Wednesday to Friday, it grew by 1/3 foot. So, from Monday to Friday, the total growth is 3/8 + 1/3 = 17/24 foot.
Since the plant was 5/6 foot tall on Friday, the height on Monday was 5/6 - 17/24 = 10/24 = 5/12 foot.