Given:

He does mistake in the order of giving preference.
We should give preference in the order, division, multiplication, addition, subtraction.
But, he gave the first preferrence to the subtraction.
72-8=64
Next, he used division
64/2=32
Next he adds 32 with 8.
So, he gets 50.
But the actual simplification is,
Simplifying we get,

Hence, the correct value of the expression is 86.
D because that is the mean
Answer:
i don't know if it is correct or not, sorry if i were mistaken
Answer:
it's all about materialistic gain.
Last one i think
x=0 or x=6