Complete study sheet won't be submitted and my own work

12. A baker records the internal temperature of a pie that has been left to cool on a counter. The room 1' temperature is 14C. An equation that models this situation is T\") ' 68015) I. + 14 where Tis the temperature in degrees Celsius and .r is the time in minutes. a) What is the internal temperature of the pie when it is left to cool? [C / l] b) Determine the temperature, to the nearest degree, of the pie after 25 minutes. [A l2] c) How much time did it take for the pie to reach an internal temperature of 31C? [A / 2] 14. It took a radioactive isotope 60 days to reduce from 100 mg to 40 mg. [T l 3] a) Calculate the halflife of the isotope. Round your answer to 2 decimal places. [2] 1:) Write the half-life exponential equation. [1] 15. An exponential graph goes through the points ( 1 , 12) and (2, 36). Find the exponential equation (Hint: substitute the coordinates of the point into y = ab' separately and then solve for a variable). [T f 4]