Answer: Option B.
Step-by-step explanation:
Given the polynomial:

Observe that
and
are perfect squares. Then, you can rewrite the polynomial in this form:

You can identify that:

Then, we can check if 

Since
, the polynomial
<em>IS NOT </em>a perfect square trinomial of the form 
The price of each taco is $10.5
What is unitary method?
We can solve this question by unitary method.
The unitary method is a method of finding the value of one unit and then finding the value of the required number of units. While solving a problem it is important to recognize the units and values.
In this question, 10 tacos cost $105.
Let's represent the cost of 1 taco as
10 tacos =$ 105
1 taco = 
10
= 105
= 
= 10.5
Each taco cost $10,5
To read more about unitary method,
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(X + .3X) / (X - 0.5X) = 1.3X/0.5X
1.3/0.5 = 2.6
2.6 x 100 = 260 %
Add 3 1/2 and 2 1/3,
Firstly, find the common denominator. It is is 6
3 3/6 + 2 2/6
this gets you 5 5/6.
Take this away from 8:
8 - 5 5/6 = 2 1/6
So 2 1/6 of the board is left over.