Look up "Everything You Need To Know About Math In One Big Fat Notebook pdf." It's the best thing I've ever been given, I have it with me in math class all the time and I've aced every test. I have it with me right now and it has everything I've ever been taught about math in it so it might help you.
Answer:

Step-by-step explanation:
Step 1
Find the radius of the circular cross section
we know that
The circumference is equal to

we have

substitute and solve for r

simplify


Step 2
Find the area of the circular cross section
The area of the circle is equal to

we have

substitute


Answer:
<h2>x < - 3</h2>
Step-by-step explanation:

Move 7 to the other side of the inequality

Divide both sides by - 5

Reverse the sign
We have the final answer as
<h3>x < - 3</h3>
Hope this helps you