The vertices of a quadrilateral in the coordinate plane are known. How can the perimeter of the figure te found
Use the distance formula to find the length of each side, and then add the lengths
Use the slope formula to find the slope of each of side, and then determine if the opposite odes are petites
Use the slope formula to find the slope of each of side, and then determine if the consecutive sides ae perpendiculas
Use the distance formula to find the length of the sides, and then multiply two of the side lengths

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?