A copy machine can print 480 copies every 4 minutes. A teacher printed 720 copies. How long did it take to print?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Plot the intercepts to graph the equation

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.