Betty's Department Store is having a clearance sale everything in the store is 1/3 off the items Xander bought have a pre-sale total price of y dollars before sales tax part A write two equivalent expressions that represent the total cost of the item at sale price before tax in terms of Y and explain how the two expressions relate to one another part b which expression is more useful why

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.