Find the central angle measure

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?