if 5x=100, x=20. If we plug this in the equation we get 5(20+2)= 5(22)= 110
I tried 24 but thats not it
arc LPM on the larger circle = 360 - 72 = 288°
arc LOM on the smaller circle = 360 - 2 (72) = 360 - 144 = 216°
so we have 17-3+9-3=14+6=20 so 30 people own a cat or a dog
Alternate way:
there is 17+9-3=23 people we then do 23-3=20 people who own a cat or a dog
The discriminant of the quadratic formula must = 0 to have only one root
b^2 - 4ac = 0
b in the quadratic formula for this case is -2b+2 a is 2b-5 c is 3
Plug these values into the red equation to find b = 4
+79 