Can you answer this? 99^9 × 66 it kinda hard for me

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241