100
Ok, 2 parts:
1. What does BEDMAS mean?
2. If you are calculating a sum (SIGMA), should we assume there are brackets around the things you are summing?
1. Order of operations - brackets, exponents, division and multiplication, addition and subtraction. Do math in an equation in this order.
2. Yes. If you are expanding a sigma to add a bunch of stuff together, assume you can bracket those sums as one part of the calculation.