The circumference of the circle is 762π cm.
<h3>What is length of arc of a circle?</h3>
The length of arc a circle can is determined with the radius and central angle of the arc.
The radius of the circle is calculated as follows;

The circumference of the circle is calculated as follows;

Learn more about circumference of a circle here: brainly.com/question/9782777
√25/4=5/2 because 5/2 times 5/2 equal 25/4. Hope it help!
R is the rate (10%)
C=20, begiing rate
T=time=8
so
h=20(1+0.10)^8
h=20(1.1)^8
h=42.8718
ronnd
$42.87
D is answer