To be considered abnormal height a 30 year old must be 1.2 feet below average or 1.2 feet above average. If the average height is 5.1 feet, at what heights (in interval notation) would a 30 year old be considered abnormal? O [0,3.7) or (6.5,00) 0 (3.9,6.3] 0 (0,3.9] or [6.3,00) 0 (3.9,6.3)

Of four points are collinear, they are also coplanar

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?

Evaluate the expression. (9 + 5)(3 + 2)0