Question 202252
Not a lot of pointing required. You have the 'numbers correct'. Wat you still need to add in are the 'units'. 
{{{100pounds = C * (r[miles])^(-2)}}}
{{{100pounds/(3963miles)^2 = C}}}
{{{C = 100pounds/(3963^2*miles^2)}}}
Now just simplify the number, but remember to leave in the units. C ends up being in terms of pounds/miles^2