Kelly tells you that when variables are in the denominator, the equation one over two plus three over x equals three over four becomes unsolvable. kelly explains, "there is a value for x that makes the denominator zero, and you can't divide by zero." demonstrate to kelly how the equation is still solvable and explain your reasoning.

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?