As you stop your car at a traffic light, a pebble becomes wedged between the tire tread. The distance the pebble is from the pavement will vary sinusoidally with time. The equation that represents this is y=-12cos1/12x+12, where x represents the time driven in seconds and y represents the distance the pebble is from the pavement in inches. What is the first time the pebble is 11 inches from the ground?

For a research project in a political science course, a student has collected information about the quality of life and the degree of political democracy in 50 nations. specifically, she used infant mortality rates to measure quality of life and the percentage of all adults who are permitted to vote in national elections as a measure of democratization. her hypothesis is that the quality of life is higher in more democratic nations. read this research description carefully. pay attention to the following: how many variables are in this research? what is the scale of the variable for infant mortality? p1c4. what is the dependent variable in this research problem? p1c4. is this research descriptive or inferential? does this research involves single variable analysis or two or more variable analysis?