3 years ago

How do I find the value of n?

2 answers:

8 0

N=5. All the angles of a triangle equal 180 degrees. So set all of your angles equal 180. 6n+1+9n-4+108= 180. Combine like terms. 15n-3+108=180. Now subtract 108 and add 3 to the opposite side. 15n=75. Then divide 75 by 15. The answer is five

wolverine [178]3 years ago

4 0

N=5. All the angles of a triangle equal 180 degrees. So set all of your angles equal to 180. 6n+1+9n-4+108= 180. Combine like terms. 15n-3+108=180. Now subtract 108 and add 3 to the opposite side. 15n=75. Then divide 75 by 15. The answer is five!

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(We should know this from our times tables, 5x12=60)

We then times the fifth by three to work out three fifths.

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We can then check this by working out two fifths and checking that both the answers add up to make 60.

We work out two fifths the same way we work out three, timesing by the value for one fifth.

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