Which property does each equation demonstrate? (3z^4 + 2z^3) – (2z^4 + z^3) = z^4 + z^3

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

What is the value of x in the this question ?

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?