In circle o, what is mae? 84° 96° 120° 168°

You can solve this with the  intersecting secant angles theorem. that theorem says that:
∠ace = (mae - mbd)/2

so
36 = (mae - 48)/2
so
mae - 48 = 72 => mae = 72 + 48 = 120

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a