I just need someone to confirm my answer so I can be certain that my book has a typo and I am not making a some minuscule mistake that is leading me to the wrong answer. A piece of metal is heated to 300 degrees Celsius and then placed in a cooling liquid at 50 degrees Celsius. After 4 minutes, the metal has cooled to 175 degrees Celsius. Find it's temperature after 12 minutes. Equation: F(t)= To+ Ce^-kt e= Euler's number I started out solving for k 175= 50 + 300e^-k4 -50 -50 125=300e^-k4 /300 /300 -The Celsius units cancel out- 125/300=e^-k4 Ln Ln Ln(125/300)= -4k /-4 /-4 k= .21887 then I plug in the value of k and solve for what temperature the metal will be after 12 minutes have passed. F(t)= 50+300e^-.21887*12 = 71.700 I end up getting the answer above but the book says the answer is 81.25 Thanks in advance for your help.