What is the best estimate for the product 289 and 7

Use the matrix-column representation of the product to write each column of ab as a linear combination of the columns of a.

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)

The radius of a sphere is 3 inches. which represents the volume of the sphere?