The hypothenuse is the longest side of a triangle, and is thus located opposite the right angle! So, if you know the length of two sides, all you have to do is square the two lengths, add the result, then take the square root of the sum to get the length of the hypothenuse
The answer is 73567374 so even
Average rate of change from x = 0 to x = 1 is

Average rate of change from x = 2 to x = 3 is

The average rate of change of both sections are equal.
Which is the most appropriate to describe a quantity decreasing at a steady rate?
With a linear equation.