Answer: 
Step-by-step explanation:
Let be "x" the price in dollars of one copy of the city newspaper.
You need to analize the information provided in the exercise:
1. The total number of copies of the city newspaper sold in the newspaper stand is:

2. The amount of money earned by selling 1,000 copies of the city newspaper is:

Then, you can determine that the value of "x" can be found with:

3. Finally, substituting values, you get:

Answer:
6 is the answer bc 24/4 equals 6
Step-by-step explanation:
Answer:
Kwan's work
Step-by-step explanation:
The given equation is:

We multiply both sides by 13.5 to obtain:

We simplify to get;

We multiply out the RHS to get:

Answer:
x = 80
Step-by-step explanation:
Let x be the unknown number
1/2 x - 10 = 30
Add 10 to each side
1/2x -10+10 = 30+10
1/2x = 40
Multiply each side by 2
1/2x * 2 = 40*2
x = 80