Answer:
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Step-by-step explanation:
Let the first integer be
. So, the next even number is 
Let's translate the formula: the square of the second is
, twice the first is
. So, the equation is

Expand the square to get

The solutions to this equations are

So, the possible consecutive even numbers are

The last one should be it
3 meters is 9.84252 feet, and 3 yards is 9 feet
So 3 meters is .84252 feet more that 3 yards.
To determine if 7, 8 and 13 can make a triangle, let's use Pythagorean theorem!
Pythagorean theorem: a² + b² = c²
Now plugging in our numbers: 7² + 8² ≠ 13²
Sadly, these numbers don't work. Therefore we cannot classify the triangle.
Hope this helps!