2016 SQA Advanced Higher Mathematics No. 16 Differential Equation Model

Given the an expression for the rate of change of the temperature of an object placed in a fridge, and pairs of readings, find when the object was placed in the fridge.

Instructional exercise consisting of question 16 from the 2016 SQA Advanced Higher Mathematics examination.

Where appropriate the alternative methods for solving the problem are also given.
Set out in stages of 'try then check' the worked solution to each part of the question.
Including indications of where each mark is allocated, and the requirements for that mark, according to the marking scheme.

[aidenmeikle]

Thanks so much for all the videos you've made for going through the AH Past Papers. They've really helped me so much with my revision. Especially for this question, I fell in to the trap of jumping too fast and was stuck at a point of simultaneous equations. You cleared it up and I was able to go back and correct it!

[qlziylh]

What is the solution to the anagram “mayor stole mint tray”?