Answer:

Step-by-step explanation:
To find, do 9^2-5^2=
, so 81-25=56 which is 2
Answer:
Use a spreadsheet.
Step-by-step explanation:
If you mean a household budget you could use a spreadsheet.
The columns would be months and the rows would be items of expenditure and income.
You use formulae ( provided by the spreadsheet) to do additions, subtractions and so on.
Volume of the cylinder ≈ 1470.27