Answer:
204 °C
Step-by-step explanation:
You want the predicted temperature of a pizza that has cooled for 20 minutes, as predicted by the formula ...
log(temp) = 2.39 -0.004·time
where temp is in degrees Celsius, and time is in minutes.
Using time = 20 in the formula, we find ...
log(temp) = 2.39 - 0.004·20 = 2.39 -0.08 = 2.31
Taking the antilog, we find the temperature to be ...
temp = 10^2.31 ≈ 204.2 . . . . . degrees C
The predicted temperature of the pizza is 204 °C.