I need help I'm in 6th grade I use to have all f but I changed it into a, b,c can someone plss help so I don't fail

Which number produces a rationale number when multiplied by 1/5

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

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)