What is the slope of the line passing through (2,5) and (0,4)

Ifigured out the question and i dont know what to put here

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.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)