Help please! as much as yall can do <3​

Can (2,3 and square root 10) be sides ona right triangle?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Find cot x if sin x cot x csc x = √2