Answer:
i think that it would be A.3 is 0.03 times 3 or C.3 is 0.03 times 100
Step-by-step explanation:
\[\sum_{n=1}^{7} 2(-2)^{n-1}\]
Answer:
x=2; the extraneous root x=42.
All the details are in the attached picture, the answer is marked with red colour.
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.
The answer to this question is 7