8 is your range, 15-7= 8.
Answer:
math is a difficult subject
Scientific notation is a system for expressing very large or very small numbers in a compact manner. It uses the idea that such numbers can be rewritten as a simple number multiplied by 10 raised to a certain exponent, or power.
Depends on the project. If you are good with budgeting im sure that you will be able to complete it.