Answer:
see explanation
Step-by-step explanation:
Using the rule of exponents
[tex]\frac{a^{m} }{a^{n} }[/tex] = [tex]a^{(m - n)}[/tex] , then
(a)
[tex]\frac{x^{7} }{x^{3} }[/tex] = [tex]x^{(7-3)}[/tex] = [tex]x^{4}[/tex]
(b)
[tex]\frac{y^{5} }{y^{4} }[/tex] = [tex]y^{(5-4)}[/tex] = [tex]y^{1}[/tex] = y
