The area of a parallelogram is A=BH where B is base length and H is height. I'm not sure why there is information about a triangular base, maybe an illustration would help. But with the information provided, the base times height is equal to 150 Ft^2. Check out the Kahn Academy video for a better explanation
The answer is 150^2 because the formula is A=bh which stands for Area=base X height and since the base is 15 and height is 10, you would do 15x10 which equals 150^2
