Notes on how to multiply/divide with scientific notation

Which system of linear inequalities is represented by the graph? !

Find dy/dx using implicit differentiation ln(20+e^xy)=y

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.