50 is 6.25% of what number?

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)

How can you find the mean absolute deviation (mad) for this set of data?

Which of the following circles have their centers on the x-axis? check all that apply.