The shaw family is building a patio. one person can place a flagstone at a rate of 4.5 per hour. the equation s=11h represents the number of stones s that two people can place in h hours. how many flagstones can 2 people place in 3 hours than one person? explain

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?