There are 13 members on a board of directors. If they must form a subcommittee of 4 members, how many different subcommittees are possible?

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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?