What is the sine ratio of angle e?

a - 5/3
b - 3/5
c - 5/4
d - 4/5

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a