Answer:
4x^2-81y^2 is NOT a perfect square trinomial, factored. You know this because if you factor this to (2x+9y)(2x-9y) then you will see that the signs between terms in the parenthesis are DIFFERENT.
Step-by-step explanation:
Taking notes as you go through the course will help you retain and process the information much better than getting "help" from a site that is probably badly named.
Answer:

Step-by-step explanation:
we know that
The volume of a pyramid is given by the formula

where
B is the area of the base
h is the height of the pyramid
we have

substitute the given values

Answer:
321
Step-by-step explanation: