Set up the equation for the following word problem and solve the equation. Let y be the unknown number.
What number should be added to
−85
−85
to get a sum of
49
49
?

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 sum of 5consecutive even numbers is 100. what is the first number in this sequence?

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?