The following data table represents the total cost of a monthly cell phone bill as a function of the number of minutes that the phone is used each month.

Minutes :500 750 1,000 1,250 1,500
Total Monthly Cost: (in dollars) $62 $77 $92 $107 $122

The table shows that as more minutes are used each month, the total monthly cost will increase at the same rate.
Assuming that this is true, what is the total monthly cost for the cell phone if it is used for 2,500 minutes?

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

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies

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so

step-by-step explanation:

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