2 2/3 divided by 1/4 as a fraction

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Precalculus question, image attached.

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?