Use the distributive property to write an expression that is equivalent to 20+10x

Write a corresponding real world problem to represent 2x - 125=400

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.

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)