Is negitive 9 a rational number

John bought 2 horses at rs 20000 each

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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)