Do values of these triangles form right triangles or not using Pythagorean theorem

Yes

Yes

No

Step-by-step explanation:

9-12-15 is just a dilation of a 3-4-5, which is right.

6-8-10 is also a dilation of 3-4-5.

However, 2-4-6 is not a triangle. In fact, it's just a line segment, because 2+4=6

your answer is b.

1,333 cubic feet  

and i know this one is right.