A hospital did a ten-year study on patients who used its services. One thousand patients were randomly selected and followed over
a period of ten years to determine the average number of visits per year. By the end of the ten year period some of the patients
had left the area. Identify the problem with the poll.

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.