Is 5 m, 20 m, 25 m a right triangle

No

Step-by-step explanation:

We can check this using the Pythagorean Theorem, .

First, we can plug our two smaller sides in for a and b, and the largest side in for c.,

Next, we can check the left side of the equation, which we find to be:

Then, we can add these products and achieve the result of 425

Finally, we can solve the right side of the equation, which equals 625

As 425 ≠ 625, this equation fails the Pythagorean Theorem, and is therefor false.

2.   2 3/5.

3.   2 1/2.

step-by-step explanation:

6 - 3 2/5

= 6 -   17/5

= 30/5 - 17/5

= 13/5

= 2 3/5 (answer).

5 1/4 - 2 3/4

= 21/4 - 11/4

= 10/4

= 2 1/2 (answer).

1/5x+9 2/5y+7

step-by-step explanation: