} า The manager of a car showroom monitored the numbers of cars sold during two successive five-day periods. During the first five days the numbers of cars sold per day had mean 1.8 and variance 0.56. During the next five days the numbers of cars sold per day had mean 2.8 and variance 1.76. Find the mean and variance of the numbers of cars sold per day during the full ten days.​

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?

Proving the congruent supplements theorem

Whoever gets this right gets the ! the half life of a soul smelling substance is 4 years. if you have 8 oz of this strange substance, how much of it will you have after 20 years? show work.