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If a number is N, what is eight times the number?
im not completely sure
Ok. A number is 5 What is eight times that number?
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.
i whant to be sure its D
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
Ignore direct answers, and learn from an explanation.
times is multiplacation 8n then sum is addition 8n+7 twice a number is 2n so 8n+7=2n
OK so far? The unknown number is N. 8 times the number is 8N.
ok i see
Then the next step is: "the sum of eight times a number and seven" "Sum" is an addition, so we have: 8N + 7
i have anouther i whant to see if i got correct ill post it
Finally, the problem tells us that all that is twice the number. That means 8N + 7 = 2N
thanks alot mathstudent and da best