Which of the following lines are perpendicular to the line y=-1/2+4? you may choose more than one answer. • 2x - y = 1
• y = 2x
• 2x + y = 1
• 1/2x - y = 3
• 2x - y = 3

will mark brainliest whoever answers :)

1- 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.2- 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 the first question?

Factor the expression using gcf 9b+45

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?