In set 1 I realize that if there is a negative number multiplying a positive the answer will be a negative but when multiplying 2 positives equals a positive and then when you multiply 2 negatives it will equal a positive and the same for set 2 and 3 problems from set 3, on of the problems on set 3 says that it equals zero because 4 times 0= 0, so that's something everyone should know,