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Ivan
3 years ago
15

A copy machine can print 340 color copies every 8 minutes. Explain or show your reasoning.

Mathematics
2 answers:
CaHeK987 [17]3 years ago
6 0
Simple:
340 copies every 8 minutes
Find copies per minute
340 / 8 = 42.5 copies/min
Now, to find out how long it took to print all 850 copies;
850 / 42.5 = 20 min.
It took 20 minutes.
Or
(850*8) / 340 = 20
mylen [45]3 years ago
3 0

Step-by-step explanation:

340=8min

850=?(x)

340x=850×8

340x=6800

x=6800/340

x=20min

so..the teachertook 20 minute to print 850 copies

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3 years ago
What is the 9th term of the following geometric sequence? 7/9,-7/3,7,-21,63 ??????
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Given:

The geometric sequence is:

\dfrac{7}{9},\dfrac{-7}{3},7,-21,63,...

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The 9th term of the given geometric sequence.

Solution:

We have,

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Here, the first term is:

a=\dfrac{7}{9}

The common ratio is:

r=\dfrac{a_2}{a_1}

r=\dfrac{\dfrac{-7}{3}}{\dfrac{7}{9}}

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a_n=ar^{n-1}

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Substitute a=\dfrac{7}{9},r=-3,n=9 to find the 9th term.

a_9=\dfrac{7}{9}(-3)^{9-1}

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