Step-by-step explanation:
1)
In a right triangle longest side is hypotenuse and the remaining two sides represent the perpendicular legs.
Hence, from the given question it is obvious that 25 is hypotenuse and 20 and 15 are perpendicular legs.
Now, by Pythagorean theorem:
2)
Because all right triangles have one hypotenuse and two perpendicular legs.
No, the graphs of the lines are not parallel because if you simplify 27x-3y=-81, you get y=9x+27, and in order to have the lines parallel, both equations must have the same "m" in y=mx+b. 6 and 9 do not equal, so no they are not parallel.
.2 is 2/10 while .5 is 1/2. 1/2 is much larger than 1/5 (which is 2/10 reduced).
The formula for a volume of a cylinder is v=πr²h. So your radius is 6 and the height is 12. so v=pi x6²x12 which equals 1,356 cubic inches. So your answer is D) 1,356.
Hope this helps!!