In the diagram, the shaded area represents approximately 95% of the scores on a standardized test. If these scores
ranged from 80 to 96, which could be the standard
deviation?

How do i do this using elimination 2x+3y=12 x-y=6

Y=4x^2+x-1 solve using quadratic formula

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?