He should choose the room that’s 15 F.
-5 C = 23 F
Meaning that 15 F is below -5 C and 25 F is not.
Answer:
The answer is c
Thermal energy moves within the air from the flames to the marshmallow.
Explanation:
Hope it helps
it's how much it weighs and how much force is pushing on it like a egg if i drop it the weigh can cause it to break and how much force the gravity is pushing on it.
Answer:

Explanation:
Given that,
The half-life of Barium-139 is 
A sample contains
nuclei.
We need to find the decay constant for this decay. The formula for half life is given by :

Put all the values,

So, the decay constant is
.