Answer:
y = -3x -72
Step-by-step explanation:

A) 22:7
B) 29:22
29 - 7 = 22, so there are 22 yellow pencils.
There are 22 yellow pencils and 7 green pencils, so the ratio of yellow pencils to green pencils is 22:7.
There are 29 pencils, and 22 of them are yellow, so the ratio of all pencils to yellow pencils is 29:22.
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It's 6 because you have to divide
=
. You cross multiply then you divide by 100 then you get your answer.
Rather than carrying out IBP several times, let's establish a more general result. Let

One round of IBP, setting


gives


This is called a power-reduction formula. We could try solving for
explicitly, but no need.
is small enough to just expand
as much as we need to.





Finally,

so we end up with


and the antiderivative is
