.00084 in scientific notation is 8.4 × 10^-4
Area of a triangle=1/2(base x height)
Area=72, Base=8, Height=2x-3
Plug it in.
72=1/2(8 x (2x-3))
72=1/2(16x-24)
72=8x-12
84=8x
x=10.5
sqrt(570025)= 755 feet
one side is 755 feet
the hint told you how to solve it
D) Radius
It is going from the center to a point on the circle