Ashopper bought shoes marked $40. the sales tax rate is 5%. how much is the sales tax

Factor this polynomial completely x^2-64

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

In the diagram, gef and hef are congruent. what is the value of x