anonymous
  • anonymous
Which equation represents "the sum of eight times a number and seven is twice the number"? 8(7 + 2N) 8N = 7 + 2N 7N + 8 = 2N 8N + 7 = 2N
Mathematics
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anonymous
  • anonymous
Which equation represents "the sum of eight times a number and seven is twice the number"? 8(7 + 2N) 8N = 7 + 2N 7N + 8 = 2N 8N + 7 = 2N
Mathematics
chestercat
  • chestercat
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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mathstudent55
  • mathstudent55
If a number is N, what is eight times the number?
anonymous
  • anonymous
im not completely sure
mathstudent55
  • mathstudent55
Ok. A number is 5 What is eight times that number?

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anonymous
  • anonymous
40
anonymous
  • anonymous
its d
mathstudent55
  • mathstudent55
Right. How did you do that? You used multiplication. Since the number was 5, and we wanted 8 times the number, you did 8 * 5. Then you actually multiplied the numbers together and got 40. That was correct. You could do the multiplication because you knew what both numbers were.
anonymous
  • anonymous
i whant to be sure its D
mathstudent55
  • mathstudent55
In our case, we don't know what number N is. We just know N represents a number. Then 8 times the number is simply 8 times N, which is 8 * N, or even more simply, 8N
mathstudent55
  • mathstudent55
Ignore direct answers, and learn from an explanation.
anonymous
  • anonymous
times is multiplacation 8n then sum is addition 8n+7 twice a number is 2n so 8n+7=2n
mathstudent55
  • mathstudent55
OK so far? The unknown number is N. 8 times the number is 8N.
anonymous
  • anonymous
ok i see
mathstudent55
  • mathstudent55
Then the next step is: "the sum of eight times a number and seven" "Sum" is an addition, so we have: 8N + 7
anonymous
  • anonymous
i have anouther i whant to see if i got correct ill post it
mathstudent55
  • mathstudent55
Finally, the problem tells us that all that is twice the number. That means 8N + 7 = 2N
mathstudent55
  • mathstudent55
Sure.
anonymous
  • anonymous
thanks alot mathstudent and da best
mathstudent55
  • mathstudent55
You're welcome.

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