20 equals 8 more than a number y

answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours