Do the following lengths form a right triangle?
a= 6.4, b= 12, c= 12.2

The way you find if they form a right triangle is by using the Pythagorean Theorem, a^2 + b^2 = c^2:

(6.4)^2 + (12)^2 = (12.2)^2

40.96 + 144 = 148.84

184.96 ≠ 148.84

Therefore, this is not a right triangle.

127 millimeters is the answer

Pp= 50 pounds of apples