Can someone pls help me the info is in the photo pick one and explain why.

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?