B use the app Photomath it helps you with this kinda questions
Answer:
Given the expression:
1.

we know:

then;

Therefore, the value of expression
is -16 i.e negative.
2.

we know:


then;

Therefore, the expression
is 16 i.e Positive.
3.

we know:

then;

Therefore, the expression
is 16 i.e Positive.
Gosh, when I saw that my mind went blank
Answer:
No
Step-by-step explanation:
The square root of any negative number is not a real number.
2 divided into 7 gives 3 with remainder 1
so as a mixed number 7/2 = 3 1/2