Someone help, quick And please

The local farm is advertising a special on fresh picked peaches. the farm charges $4.25 to pick your own peck of peaches and $3.50 for each additional peck you pick. write an equation for the total cost of peaches in terms of the number of pecks. deine your variables. how much does it cost to pick 3 pecks of peaches?

Its worth 10000000 points need asap if you answer correctly ill mark brainliest

Is this a polynomial function? i need to know asap