valdezavery1373
09.02.2021 •
Mathematics
Penelope has a smart phone data plan that costs $35 per month that includes 9 GB of data, but will charge an extra $25 per GB over the included amount. How much would Penelope have to pay in a month where she used 5 GB over the limit? How much would Penelope have to pay in a month where she used went over by xx GB?
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Ответ:
We have got an geometric progression.
We use to find any term of a geometric sequence, this equation:
an=a₁ * r^(n-1)
a₁= is the first term.
r=is the common ratio.
n=numbers of the term to find.
r=an / an-1
In this case:
r=a₂/a₁=(-4.8) / 9.6=-0.5
a₁=9.6
an=9.6*(-0.5)^(n-1)