What is the length of the hypotenuse if a= 5 and b= 7

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122