I think the answer is 18.7
The 2 graphs on the left are exponential
The other 2 are linear
Its is 9 cm. I know because the 13 cm side isn't equivalent to the 13 cm side so if you measure it like i did you will get the answer 9cm.
(a) Using Newton's Law of Cooling,

, we have

where T is temperature after T minutes.
Separate by dividing both sides by T - 75 to get

. Integrate both sides to get

.
Since

, we solve for C:

So we get

. Use T(30) = 150 to solve for k:

So

But choose Positive because T > 75. Temp of turkey can't go under.

(b)

Dogs of the AMS.