Progettazione di uno studio epidemiologico. Pensa come faresti uno studio osservazionale e uno studio sperimentale
per sapere se c'è associazione tra la malattia parodontale e un fattore
di rischio che scegli.

Asilkworm winds its cocoon out of one long silk fiber. to make silk thread, 3 to 10 of these silk fibers are unwound from their cocoons and combined into aa single thread with a typical length of 300 yards. choose a reasonable number of silk fibers in a thread write an equation to find the total length of the silk fibersused in 300 yards of the thread

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

For the inequality |c| < |d| to be true, which of the following must be true?