Tickets for the Hollywood History Tour Bus are $12.50 each. To make expenses, the company needs to gross $2025 each day. How many customers per day does the tour company need to earn that much revenue?

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?