The answer are B, D and F.
If you solve for x for B, D and F, you'll get (1/2,5)
You would need to find the area of which the irrigation would cover:
Area of a circle=pi*r^2
=300^2*pi
=90000pi ft^2
Hope this helps
Do you have any options of the equivalent expressions or is it just a plan question that you just asked?
15% = 0.15
x% of any number is 0.x * that number
so the answer is 0.15 * 60 = 9
