Consider the attached figure. The height CD cuts the triangle exactly in half. This means that

Moreover, since CD is the height of the triangle, we know that ACD is a right triangle. We know the hypothenuse AC to be 20 feet because it is a side of the triangle, and we just found out that AD is 10. We can use the pythagorean theorem to deduce

So, the area is

Option C:
is the correct answer.
Explanation:
The given expression is 
We need to determine the factor of the expression.
Now, let us break the given expression into two groups.
Hence, we get,

Simplifying, we get,

Let us factor out 7g from the term 
Hence, we have,

Similarly, let us factor out -6h from the term 
Thus, we have,

Now, we shall factor out the term
, we get,

Thus, the factorization of the given expression is 
Therefore, Option C is the correct answer.
Answer:
11:13
Step-by-step explanation:
132:156
Split in half
66:78
Again
33:39
By 3
11:13
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