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natima [27]
4 years ago
13

Twice the sum of a number and 9 is 30

Mathematics
1 answer:
muminat4 years ago
5 0

Answer:

2x+9 is the equation

x = 10.5

Step-by-step explanation:

2x + 9 = 30

2x = 30 - 9 = 21

x = 21 ÷ 2 = 10.5

Hope this helps!

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Prove that in any pythagorean triple, one of the side lengths is divisible by 5
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The trick is to realize what your choices are.

if m or n or both are divisible by 5, then 2mn will be divisible by 5
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In the first case m^2 = 4 mod(5) and in the second case m^2 = 1 mod(5) N has the same considerations. 
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