What is the domain of this function?

Arational number that is equivalent to -20/4?

The equation for two lines in the coordinate plane are 2dx+y=4 and -6x+y=3, where d represents an unknown value. what value(s) of d would make these lines parallel?

Marshall went to the state fair and bought 3 tickets. each ticket to the fair cost x dollars. after he bought the tickets, he had $3.25 left in change. write an expression that represents the amount of money, in dollars, that marshall had before he bought the tickets. n