I dont know how to do this pls help

Sunday: 1 1 2 monday: 1 tuesday: 2 1 2 wednesday: 1 3 4 thursday: 2 friday: 1 1 2 saturday: 2 jenna is a swimmer and trains every day. the schedule shown outlines the number of hours she trains each day. what is the total number of hours that jenna trains during the week?

Witch represents the inverse of the function f(x)=1/4x-12

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle