Evaluate (z^2)^4/5z^5 when z=5 and simplify

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

If you could answer these your a life saver