Answer:
Step-by-step explanation:
the absolute value of any complex number a+bi is : √(a²+b²)
Answer:1,5
Formula = 4/3 x pi x r^3
4/3 x 3.14 x 7^3 = 1436.03
answer: a. 1436.03 cubic units
So we have . Then
and the answer is D.