Find the vertex of y = x2 + 14x − 40 by completing the square.

What is the result of converting 60 ounces to pounds remember there are 16 ounces in a pound

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?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2