Questão 7)Qual a média das medalhas de ouro? questão 8)qual a média de medalhas de prata? questão 9)qual a média de medalhas de bronze?

Pls , the question is in the picture!

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?

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?