Evaluate the expression when x=4, y=-6, and z= -3. 3x – 2y

Z

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

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?