În desenul alăturat sunt 3 tipuri de pătrate de dimensiuni diferite. Latura celui mai mic este de 20cm. Care este lungimea liniei marcate în desen?

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 ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.