Answer:

Step-by-step explanation:
The length of any arc is calculated using the following equation:
s = r*θ
Where s is the length of the arc, r is the radius of the circle and θ is the angle in radians.
So, if we have a Circle O and a centrally angle AOB that measures π/3 radians, the value of the length of arc AB is calculated as:

Where r is the radius of the circle O.
Question 20 is 2/11 i believe
A rational expression is undefined when the denominator is zero.

is undefined when x=0 or x=2.
$8.50 minus $14.00 would be -5.5 so the answer is -5.5$