Divide 2 by a, double the result, then raise what you have to the 8th power

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

If wxyz is a square, which statements must be true? plz < 3

Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !