The graph below shows the cost, in dollars, per notebook at the school store Notebook Costs
14
12
10
Cost (in dollars)
0
7
6
Number of Notebooks
Use the drop-down menus below to create an equation that represents the total cost, t, per n notebooks.
Participants

u dumb boi

step-by-step explanation:

14

step-by-step explanation:

14 x 3 = 42

a: 1/6, j: 1/4

step-by-step explanation: you are welcome

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