What is the area of an equilateral triangle that has sides of 2 yards and a height of 4.25 feet?

The first thing you need to do is convert the yards into feet. In one yard there are three feet. So 2*3=6 now you can do the triangle area equation. 
6*4.25=25.5 then divide by two. 25.5/2=12.75
So the area of the triangle is 12.75 ft^2
Hope this helps