Answer:
23.55
Step-by-step explanation:
We know it's three quarters of a circle since the angle is
°
Therefore we can calculate like a normal circle and multiply by
.
The formula for calculating the circumference is 2 times pi times the radius or
.

Answer:
x = -81 / 19
Step-by-step explanation:
y = kx
-57 = 9k
k = -57/9 or -19/3
27 =
-19x = 81
x = -81 / 19
The correct answer is 3×10^16