Answer:
The equation of line is:

Step-by-step explanation:
We are given that a graph is a that passes through two points:
and 
We know that the equation of line passing through two points:
and
is given by:

Here we have:
and 
Hence, the equation of line is:

Hence the equation of line is:

If it was in standard notation it would be very confusing to add the number of cells and it would be less organized.
ANSWER
The percentage decrease is 10.4%.
EXPLANATION
To calculate percentage decrease, use the formula,
Percentage decrease

Yesterday the price of coffee was 2.40. This is the old price.
Today the price is 2.15. This is the new price.




To the nearest tenth, we have:

Therefore the percentage decrease is 10.4%.
28% equals 28/100. So, 28% equals 28 per 100.
*) 2/4+3i
2+3i
I'm not sure is that right or wrong