Charlie needs to rent a car. Company A charges a rate of $40 per day, d, and company B charges a $60 fee plus $20 per day. For what number of days is the cost the same?

  3

Step-by-step explanation:

Since d represents the number of days the car is rented, Company A charges ...

  40d

Company B charges ...

  60 +20d

We want to find the value of d that makes these charges be the same value:

  40d = 60 +20d

  2d = 3 +d . . . . . . . divide by 20

  d = 3 . . . . . . . . . . . subtract d

The cost is the same for 3 days.

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step-by-step explanation:

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geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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