Factor completely 4x^2-81

Acompany is testing in comparing to lightbulb designs the box plot shows the number of hours that each lightbulb design last before burning out which statement is best supported by the information of the plot

Graph y = -|x| + 2. click on the graph until the correct one appears.

Which expression is rational? 6. , square root two, square root 14, square root 49