(3x2 + 12 – 4x) + (9x2 – 3x + 5)
by step pls

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test

Julie begins counting backwards from 1000 by 2’s and at the same time tony begins counting forward from 100 by 3’s.   if they count at the same rate, what number will they say at the same time?

Dylan is evaluation the expression 13+19+7+10 at one step in his work, dylan rewrites the equation as 13+7+19+10 which property of addition must dylan have used when he evaluated the expression?