Answer:
<h2>36</h2>
Step-by-step explanation:

Answer:
Answer to A would be 147872265.5 km squared.
I don't really have enough information to get B and C. But i can help. To get the people per kilometer, you divide the number of people by 147872265.5. And you can do the same for ants. Then for C. you divide the number of ants by the number of people. Hope this helps!
'Which area represents elements contained in the sample space that are not contained in swimmers or weightlifters?'
d')
It is outside of the diagram, and is not concerned by both swimmers and weightlifters.
After putting the value of y from the second equation to the first equation, the resultant equation is
.
GIven:
The equations are:

It is required to put the value of y from second equation to the first equation.
<h3>How to solve equations?</h3>
The value of y from the second equation is,

Now, put this value of y in the first equation as,

Therefore, after putting the value of y from the second equation to the first equation, the resultant equation is
.
For more details about equations, refer to the link:
brainly.com/question/2263981
If I assume you meant

Then the answer is at 4 minutes. This is just the vertex form of the parabola which is
where (h,k) is the vertex. h = 4 so the vertex is at 4 in the x-axis, or in the context of the problem it means at 4 minutes.