Answer:
it is a special type of ratio. It will compare 1 unit of some quantity to a different number of units of a different quantity
Step-by-step explanation:
Answer:

Step-by-step explanation:
Given:
The average cost of a computer in the year 2000 is given as:

The average cost of a computer in the year 2008 is given as:

Now, the difference in average cost between the years 2008 and 2000 can be calculated by subtracting the average cost in 2000 from the average cost in 2008.
Framing in equation form, we get:
Difference in average cost (ΔC) is given as:

Therefore, the difference in the costs for a computer between 2008 and 2000 is 
I think its 36
Hope this helps sorry if im wrong
Not sure about the last question
You must convert 56 to cm comment on that answer and will help from there