Two consecutive negative integers have a product of 110. what are the integers?

Perform the indicated operation. 8/a - 6/a + 7/a

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?