It has an infinite rotation symmetry because no matter how you rotate the object, it look the same.
Cos(60) = cos(90 - 30) = sin(30) = 1/2
This should be what you want.
I think it is 64 just multiply 4 times 4 times 4 because of the sides and to find volume you need to multiply the sides and the height so it should be 64.
We have been given the expression

We can rewrite the expression as 
In order to simplify the given expression, we can check if we have any common terms in the numerator and denominator.
We can write the term 72 which is in the numerator as 
Thus, the expression becomes

We can see that 4 is common in both numerator and denominator. Hence, we can cancel 4. Thus, we are left with

Therefore, we can rewrite the given expression as 54.
Answer: 3(n-2) =3n-6
Step-by-step explanation: There all separate groupings