7. As people leave a restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out.
Was the sample obtained using a valid sampling method? If so, what
percent of those surveyed say they usually do not order dessert when they
eat out? If not, explain why.

Find the slope of the line y =8/9x + 1.

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

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.