Consider the equations:
y=15x-45
y=12x+18
How many solutions do they have?

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.

Yesterday i ran 5 miles. today, i ran 3.7 miles. did my percent increase, decrease or is it a percent error? plz i need

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)