Pls Help 20 points to anyone who gets it right i need the sale price and regular price, actually i need all of the blanks filled

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

What are “like terms”? why can we only add like terms?

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.