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Q: 2n2 plus 15n plus 7

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7

The 15 in 15N is the mass number. The mass number is the sum of the number of neutrons and protons. If we know nitrogen has 7 protons, then 15N must have 8 neutrons.

It is not an element but a 15N(-3) ion.

Nitrogen-15 has 7 electrons and protons and 8 neutrons.

7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 or 7 x 14 = 98 Dont you have a calculator...?

okay well the answer to that is 91 got it (PS. you should know it!) :) peace!

58.

The answer is 380, I hope. :P

7 + 7 + 7 + 7 + 7 + 7 + 7 or 7 X 7 = 49.

7+7+7+7+7+7+7+7 is the same as 7 multiplied by 8, so the answer is 56.

Yes.

7 Times 7 Equals7 plus 7 plus7 plus7 plus7 plus7 plus 7, or 7 times 7, equals 49.

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