Standard Rental Plan, they can rent a car for $52/day plus 23 cents/mile Deluxe Rental Plan, they can rent a car for $80/day with unlimited mileage. Let x represent the number of miles traveled per day, and let y represent the total cost of the rental for a day. After graphing the equations for each plan, estimate the break even point of the rental costs for one day

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.

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