



 
Hi Rita, Let me do an example.
What this is asking is for you to write a function A(x) which gives the area of the triangle and the variable in the function is x. I drew a diagram and labeled the triangle ABC with BC = 4 inches. I let D be the midpoint of BC and then AD = h, the height of the triangle and hence the area of the triangle is
Triangle ADC is a right triangle and hence by Pythagoras theorem
Thus the area of the triangle is
Hence I have what was requested
the area written as a function of x or, the area expressed in terms of x. I hope this helps,  


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