Answer:
Step-by-step explanation:
line RPN = 180 = 4y - 10 + 90 + y
180 - 90 + 10= 5y
100 = 5y
y = 100/5
y = 20
Question 18:
arc SRQ = 360° - 98° - 115° = 147°
y = 147°/2 = 73.5°
arc SPQ = 98° + 115° = 213°
x = 213°/2 = 106.5°
Sorry, I don't know how to answer 19.
hope this helps. good luck.
