For this we will use equation:
H = starting height + rate_of_growth*periods
We can mark H with index w to represent how many weeks have passed.
Because all of this we can write:
Hw = 200 + 0.5*w
To calculate height after some number of weeks all you need to do is to exchange w with number of weeks.
Here, the answer is “divide the previous value by 5.”
You can make sure:
125/5 = 25
25/5 = 5
5/5 = 1
1/5 = 1/5
1/5 / 5 = 1/5 x 1/5 = 1/25.
So, we checked and made sure that each number divided by 5 equaled the number below, and confirmed this rule!
Hope this helps! :)