Answer:
13
Step-by-step explanation:
A triangle is 180º. We have two angles; 60º and 60º
60+60 = 120
180-120 = 60º
This means that this is an equilateral triangle and all the sides are the same length.
13
well, you already know how to convert from mixed to improper, so let's simply do the division.

The prime factorization of 576 is 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 or 2^6 * 3^2
The prime factorization of 64 is 2 x 2 x 2 x 2 x 2 x 2 or 2 ^ 6