Suppose there is a 1/2 degree F drop in temperature for every thousand feet that an airplane climbs into the sky. If the temperature on the ground is ​56.7 degrees F, what will be the temperature when the plane reaches an altitude of ​?

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?