M(m+8)
i don't understand this question on my homework sheet

Asphere has a diameter of 10 in. what is the volume of the sphere?

What is the solution set of the quadratic inequality x^2-5< or equal to 0

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)