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lord [1]
3 years ago
11

Prove if the sum of the digits of a 3 digit number n is divisible by 9, then n is divisible by 9.

Mathematics
1 answer:
beks73 [17]3 years ago
6 0

n=100x+10y+z\\x+y+z=9k,k\in\mathbb{Z}\\\\n=99x+9y+x+y+z\\n=99x+9y+9k\\n=9(11x+y+k)

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Answer:

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3 years ago
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5 0
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Read 2 more answers
2. What is an equation line that pass-cs through the point (3,-1) and h (4)
joja [24]
Y=mx+b
m=slope
b=y intercept
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one solution is x=3 and y=-1 or
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also slope=2
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subtract 6
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answer is number 4
5 0
3 years ago
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