2e min :)) pls park braliest
        
             
        
        
        
Answer:
proof in explanation
Explanation:
First, we will calculate the number of half-lives:

where,
n = no. of half-lives = ?
t = total time passed = 2100 million years
 = half-life = 700 million years
 = half-life = 700 million years
Therefore,

Now, we will calculate the number of uranium nuclei left ( ):
):

and the rest of the uranium nuclei will become thorium nuclei ( )
)

dividing both:

<u>Hence, it is proven that after 2100 million years there are seven times more thorium nuclei than uranium nuclei in the rock.</u>
 
        
             
        
        
        
Answer:
The starting velocity.
Explanation:
We must understand that this equation comes from the following equation of kinematics.

where:
Vf = final velocity = 33 [m/s]
Vo = starting velocity [m/s]
a = acceleration = 3 [m/s²]
t = time = 30 [s]
So, these values can be assembly in the following way:
