19, 20, & 21 (add them up)
17x= 13 and 8 are both y's so you combine them by subtracting 13 from both sides and then you have 17x=-5y
The answer to this question is c
Answer:
Ф=144
Ф =s/r ( Ф is the central angle,s is the arc length, r is the radius)
find r:
radius =circumference/2π=1/2π=0.16
Ф=(2/5) /(1/2π)=4π/5=144 degree (π=180)
Ф in degrees: 144 degrees
