Answer:
The refrigerator was at around 13 ∘C
Step-by-step explanation:
Newton's Law of Cooling:
The rate of change of a body temperature (amount of heat loss/time of loss) is directly proportional to the difference between its own temperature and the surroundings.

T ⇒ temperature
t ⇒ time
Tenv ⇒refrigerator temperature
⇒ rate of change of he temperature
-h ⇒ constant of proportionality (negative because the temperature is decreasing inside the refrigerator)
We have 3 points:
time (minutes) - Temperature (∘ C)
0 (when the pan was put in the refrigerator) - 46
15 (after 15 minutes) - 27
30 (15 minutes after the first 15 minutes) - 19
= -h (27 - Tenv)
= -h (19 - Tenv)
Now we have a system of two equations and two variables


The refrigerator was at around 13 ∘C
Answer:

Step-by-step explanation:
Complex numbers identity:
The complex numbers identity is:

Square of the sum:

In this question:





So

Divide 31 by 50 and that will give you .62 move the decimal point two places to the right and that gives you 62%. :)
I am too lazy to do question 6 if u want the answer tell me
Answer:
x = 5/3
Step-by-step explanation:
4x= x + 5
3x=5
x = 5/3