Answer:
I answered it using pictures because I dont know how else to put the answers down.
Answer: integer
-64² = -4096. an integer is a number that can be written without a fraction, in this case, -64² doesn't require one
A quadrilateral is the category
Answer:
Solving the radical
we get 
Step-by-step explanation:
We need to express the radical
using the imaginary unit i
Prime factors of 81 are: 3x3x3x3
and 
Solving:

So, Solving the radical
we get 