1.Diseñar un esquema E/R que recoja la organización de una base de datos para contener la información sobre todas las carreteras del país, sabiendo que se deben cumplir las siguientes especificaciones:2.- Las carreteras están divididas en varias categorías (locales, comerciales, regionales, nacionales, autovías, etc).3.- Las carreteras se dividen en tramos. Un tramo siempre pertenece a una única carretera y no puede cambiar de carretera.4.- Un tramo debe pasar por una o varias comunas, interesando conocer el kilómetro de la carretera donde empieza la comuna y el kilómetro donde termina.5.- Para los tramos que suponen principio o final de carretera, interesa saber si es que la carretera termina físicamente o es que confluye en otra carretera, en caso de confluir interesa conocer con qué carretera confluye y en qué kilómetro, tramo y comuna.

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One main difference is that a graphing calculator can graph out functions while a scientific calculator cannot. there are some scientific calculations that have built-in table functions, but generally (and obviously) scientific calculators are not built to be able to graph. graphing calculators have larger screens to accommodate for their eponymous use.furthermore, graphing calculators are usually more advanced. because of the specifications needed (like ram, processor) to be able to generate graphics, graphing calculators are able to support more sophisticated functions/features. some graphing calculators have a computer-algebra system, like the ti-89 titanium. some support spreadsheets. some even support programmable games. some allow for connectivity with a computer to install new programs.we have to consider another major difference: the price. graphing calculations are way more expensive than scientific calculators. i believe this has to do with the history behind graphing calculators. for example, texas instruments basically holds a monolopy over graphing calculators. school keep using tis because that is what they are familiar with.