Y= 2x + 4 2x - y = 6 solve the system of equations using substitution. a) (2, 8) b) (2, -8) c) (10, 24) d) no solution

Can someone plz me understand how to do these. plz, show work. in exercises 1-4, rewrite the expression in rational exponent form.[tex]\sqrt[4]{625} \sqrt[3]{512} (\sqrt[5]{4} )³ (\sqrt[4]{15} )^{7}\\ (\sqrt[3]{27} )^{2}[/tex]

What is the value of -3/4 to the 4th power? -256/81 -81/256 81/256 256/81

15. if the 8% tax on an item amounts to $0.96, what is the final price (tax included) of the item?