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maxonik [38]
3 years ago
8

Christy is doing her homework. After every 15 minutes of studying, she gets up and takes a 5 minutes break. If she has 2 hours i

f homework to do, how long will it take her to finish it.
Mathematics
1 answer:
gavmur [86]3 years ago
3 0
2 hours is also 120 minutes

120/15=8

8 x 5=40

120+40=160

It will take her 160 minutes to finish, or 2 hours and 40 minutes
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2 years ago
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\displaystyle
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<em>-------------------------------------------------------------</em>


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----------------------------------------------------

\displaystyle&#10;(3x^2+y)^n=\sum_{k=0}^n\binom{n}{k}(3x)^{2n-2k}y^k=\sum_{k=0}^n\binom{n}{k}\cdot 3^{2n-2k}\cdot x^{2n-2k}y^k\\\\&#10;n=5\\&#10;k=4\\\\&#10;\binom{5}{3}\cdot3^{2\cdot5-2\cdot4}=10\cdot3^{2}=10\cdot9=90

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