Use this formula and I can't answer because you do not tell me which one is the height.
Isn’t it because of dilation?
Answer:
The 64th term of the arithmetic sequence is -1075.
Step-by-step explanation:
Arithmetic sequence:
In an arithmetic sequence, the difference between consecutive terms, called common difference, is always the same.
The nth term of an arithmetic sequence is given by:

In which
is the first term.
−4,−21,−38
First term -4, so 
Common difference of 
Thus


Find the 64th term of the arithmetic sequence
This is
. So


The 64th term of the arithmetic sequence is -1075.
We know that the interest decreased by 29.3%, therefore
what was left now is simply just 70.7% of the original, therefore we divide
this by 0.707
rate = 7.7% / 0.707
rate = 10.89%
<span>So the rate was 10.89% 10 years ago</span>