1. 1000 2. 0.001. hope this helps.
The value of x is usually 1, most of the time x is just used as a place holder
If it decreases by 80٪, then only 20٪ remains.
15×20٪=15×20/100=15×0.2=3
Answer: 3
<h3>
Answer:</h3>
A.
+-5x+14x+-35
+9x-35
B. 

C. 

D. 


Step-by-step explanation:
A. (3x*2x)+(3x*-5)+(7*2x)+(7*-5)
Multiply and simplify.
+9x-35
B. (
)+(
-3x)+(2x
)+(2x
)
Multiply and simplify.

C. 
Multiply and simplify.

D. 
Multiply and simplify.

I hope this helps!
But you should really do this yourself.