F(x)=2x-4x . This function has no axis of symmetry nor a vertex, it's a linear function, I believe you forgot something to be a quadratic function
Answer:
K-a Positive constant that depends on the area and nature of the surface of the body under consideration.
Step-by-step explanation:
Newtons law cooling describes the rate at which an exposed body changes temperature through radiation which is approximately proportional to the difference between the object’s temperature and its surroundings, provided the difference is small. The formula is given as:

where,T- temperature at time t,
is temperature of the surrounding and k- A Positive constant that depends on the area and nature of the surface of the body under consideration.
Answer:
you maybe can install app photomath
The answer is A. Or 5 cm.
Hope this helps,
kwrob