The Jones brother , Carl , Cameron , and Carlos , are painters . Together they can paint a standard sized room in 2 hours . If Carl is alone on the job he can paint the room in 5 hours . If Cameron is alone he can paint the room in 6 hours . (a ) What equation can be used to determine how long it would take Carlos to paint the room alone ?
(b ) How long would it take Carlos to paint the room alone ?​

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?