Researchers find that people who spend more time watching television spend less time reading. (yeah, big surprise.) what kind of correlation does this study illustrate? ​

We are talking about a negative correlation, since the increase in one variable (time of watching TV) results in a corresponding decrease in the other variable (reading time). To know if it is a linear or curvilinear correlation, we need to have a deeper study of the variables, meanwhile, with the previous information we can suppose that it is linear.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.