Question 230188
t = 504 / r


t - 3 = 504 / r+14


substituting ___ 504/r - 3 = 504 / r+14


multiplying by r(r+14) ___ 504r + 7056 - 3r^2 - 42r = 504r


subtracting 504r and dividing by -3 ___ r^2 + 14r - 2352 = 0


factoring ___ (r + 56)(r - 42) = 0


r - 42 = 0 ___ r = 42