It costs $12 to rent a zip car for one hour. let him represent how many hours you rent the car. a. write an expression to show how much it would cost to rent the car for her hours. expression: b. it costs a total of total of $84 to rent the car. write an equation to show what is going on. equation: c. how many hours did you rent the car? equation:

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

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?