Answer:
2.b
3.a
4.c
Step-by-step explanation:
hope it helps you
Answer:

Step-by-step explanation:
Given

Required:
Simplify
We start by opening the bracket


Collect Like Terms

Hence, the equivalent expression is 
We are given numbers √9 and -7.
Square root 9 is a perfect square.
Square root 9 = 3.
So, if we add square root 9 and -7, we would get
√9 + -7 = 3 -7 = -4.
So, we got a negative whole number.
<em>A negative or positive whole number is called an integer</em>.
So, it's an integer.
<h3>Therefore, correct option is D. Integer.</h3>
C=2πr=2·π·13≈81.68141
C=81.68

Let

. Then the eight roots of

are


where

. So the eighth roots are