Help in math plzzd

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

(01.02 lc) angle abc has point e on ray ba and point d on ray bc. points e and d are equidistant from point b. to bisect angle abc, which of the following needs to be identified for the construction? the distance between points e and d the point in the angle that is equidistant from points e and d the endpoint of rays ba and bc the point outside of the angle that is equidistant from points e and d

Don't know how to find x given these segment lengths