Un dispositivo especial permite ahorrar un 30% de combustible en un motor; un segundo dispositivo, si actúa sol, permite un ahorro de un 50% y un tercero, también si actúa solo, de un 20 %. Si se instalan los tres dispositivos juntos en el motor ¿Qué porcentaje de ahorro de combustible puede obtenerse?

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1. convert. simplify your answer and write it as a proper fraction or as a whole or as a mixed number.4oz =_ pounds2. what is 1/3 of 66for both show work.

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?