(560+48x)/x. After owning the washing machine for x years, with operating cost of $48 each year, the total amount of operating cost is 48x. We should also add the one-time cost of buying the washing machine, which is $560. The total cost is 560+48x. Since x years have past, the average annual cost is (560+48x)/x, or 48+560/x dollars.
For every $2 donated by an employee, the corporation matches with $3.
The amount donated by the corporation is c, and the amount donated by employees is e.
When the employees donate $2, the corporation donates $3.
We can write 2e=3c.
The question is biased towards a response of preferring to use weight-lifting machines because it uses the words "hard" to describe free weights and "easy" to describe the machines, and may persuade some people to choose the machine.
The sample is not biased because it doesn't choose specific women, it includes all women who visit the gym.
