An adult human lung has a volume of 2. 9 liters. If its volume decreases to 1. 2 liters and it contains 0. 049 mole of air after it exhales, how many moles of air does it contain when full? A. 0. 025 mol B. 0. 041 mol C. 0. 083 mol D. 0. 12 mol E. 0. 14 mol.

Plzzz maths ! quadratic sequences=an^2+c 1) 11,17,27,41,59 2) 7,16,31,52,79 3) 6,18,38,66,102 4) 0,9,24,45,72 5) 0,12,32,60,96

Which of the following is true for the relation f(x)=2x^2+1

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?