Suppose the demand d, in units sold, for a company's jeans at price x, in dollars, is d left parenthesis x right parenthesis equals 400 minus 4 x.
a. If revenue equals price times demand, write the rule for the function r(x), which represents the company's expected revenue in jean sales. Then state the domain of this function.
b. If the price is $50, how much revenue will the company earn?

a. The rule for the function r(x) is r(x) = __
nothing.
The domain of the function r(x) is __
b. At a price of $50 the revenue will be $__

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.