The length of that arc is (90/360)·2·π·6 = (1/4)·12·π = 3·π ≈ 9.42 units;
A and B are correct... reason is because hundredths is 1/10 to tenths and tenths are 10 times bigger than hundredths. C and D are wrong.
Hope this helped!
Nate
Answer:

Step-by-step explanation:
<u><em>The question is</em></u>
Which equation should she use?
we have the formula

Solve for k
That means ----> isolate the variable k
Multiply by 2 both sides

Divide by x^2 both sides

Rewrite

Sorry it's wonky but I hope you get it if you don't I can explain again