AnswerStep-by-step explanation:
.99 is right, you already know.
So first,
8 Down arrow 2
means sqrt8
The 8 goes inside the sqrt and the 2 goes outside (its called an index) but we like never write that 2. Its just a normal square root. If you are using a calculator (I think practically, you must use a calculator) you can find sqrt8. Then
take
sqrt8 UpArrow 6
means (sqrt8)^6
this is 8^3 or on the calculator 512.
Next,
512 SideArrow 500
means 500/512
this is .9765625
Lastly,
.9765625 DownArrow 4
means
4throot(.9765625)
Your calculator might have a 4throot button, but you can use 1/4 power instead because all roots can be written like fraction powers.
When .9765625 is in your calculator screen you can just use the ^ button or x^y button to raise it to the 1/4 power. (Use .25 for 1/4 or use parenthesis on the (1/4) )
(.9765625)^.25
~= 0.99
see image.