I'm assuming the integral is

We have

Then substituting
and
, the integral transforms and reduces to

which we can rewrite as

and so

Answer:
<h2>-1</h2>
Step-by-step explanation:

80 kilometers is equal to 80,000 meters. This is greater than 1000 meters.
145-10x=10x-35
Add 35 to both sides.
175-10x=10x
Add 10x to both sides.
175=20x
Divide both sides by 20
8.75=x