Step-by-step explanation:
the question is z²=1
taking square root on both sides
√z² = √1
the square root and the square cancel out each other
it gives
z=±1
that means either z=+1 or z=-1
so the solutions are 1 and -1
The cube root of -216 is -6.0
Answer: A. 
Step-by-step explanation:
The answer is A,
because a binomial has two terms
In other words if there is a single sign like '+'
Answer:
30
Step-by-step explanation:
15/3=5
5 x 5 = 25
25 + 5 = 30