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If the terms get bigger as you go along, the common difference is positive. If they get smaller, the common difference is negative and if they stay the same then the common difference is 0.
Whole numbers are positive numbers from zero to infinity. Integers are both positive and negative numbers. So whole numbers and integers have positive numbers in common, but only integers have negative numbers. Both have zero, and both have no fractions.
Beta particles can be either positive or negative. It depends if an electron or a positrion is emited. Usually though, beta particles are negative as it is much more common for an electron to be emitted (though that does depend on the substance).
Students may have this problem, -4+5 and the answer would be a negative because negative plus a positive is going to be negative.. and they could mess up and put it as a positive which would make the problem incorrect.. so always be careful when working with math! :)glad i could help.
Working with a number line to solve there problems.