How do i find the geometric between 8 and 18

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

Can someone me i’m confused. will give brainliest and a whole bunch of points

Jenny earned a 77 on her most recent test jenny score is no less then 5 points greater then 4/5 of terrance’s score if t represents terrance score which inequality represents the situation