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Elan Coil [88]
2 years ago
6

How can you use a pattern to add 20+30+40+50+60+70+80​

Mathematics
1 answer:
Usimov [2.4K]2 years ago
8 0

Answer:

\displaystyle \: \: \: \: 7 \\ \: \: \sum \: (10n + 10) \\ n = 1

Step-by-step explanation:

You can use Summation Notation as a pattern to evaluating "20 + 30 + 40 + 50 + 60 + 70 + 80":

\displaystyle \: \: \: \: 7 \\ \: \: \sum \: (10n + 10) \\ n = 1

I am joyous to assist you anytime.

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Answer: Mark has 28 marbles while Don has 85 marbles.

Step-by-step explanation:

Let x represent the number of marbles that Mark has.

Let y represent the number of marbles that Don has.

If Don has 1 more than 3 times the number of marbles Mark has, it means that

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The total number of marbles is 113. It means that

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Substituting y = 3x + 1 into equation 1, it becomes

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x = 112/4

x = 28

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3 years ago
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Average must be 225 or more
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