Answer:
The dependent variable is the variable that is studied while the independent variable is the variable that is being manipulated
We can solve the problem by using the ideal gas equation:

where
p is the pressure of the gas
V is the volume of the gas
n is the number of moles of the gas
R is the gas constant
T is the absolute temperature of the gas
For the gas in our problem, we have:




If we rearrange the equation and we put these numbers into it, we find the volume of the gas:
Answer:

Explanation:
This is an exercise where you need to use the concepts of <em>free fall objects</em>
Our <u>knowable variables</u> are initial high, initial velocity and the acceleration due to gravity:



At the end of the motion, the <u><em>rock hits the ground</em></u> making the final high y=0m

If we <em>evaluate the equation</em>:

This is a classic form of <u><em>Quadratic Formula</em></u>, we can solve it using:




Since the <u><em>time can not be negative</em></u>, the <em>reasonable answer</em> is

Idk no idea none zero sorry hope someone know more than me