Answer:
3) False
4) False
Explanation:
3) Because 12x5=60, and 18 DOES NOT go into 60 evenly.
60/18= 3.33 -> Not a whole number
4) Because the -7 is not what determines the parabola to be up or down. If it were a +7 instead of -7, it still would make the parabola open down.
-THE ONLY WAY the parabola would open up... is if you change the -3x^2 into a positive (3x^2)