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Verified Answer :

I hope this helps you




Area=height ×base/2



Area=7x.4x/2


Area =14x^2

metchelle

In order to get the answer, let us analyze the given image first. 
The formula for getting the area of a triangle is A = 1/2(b*h).
So let us plug in the given values.
A = 1/2(4x)(7x)
A = 1/2 (28x2)
A = 14x^2
Therefore, the correct answer would be option D. The area of this triangle expressed in monomial is 14x^2. Hope this answer helps.