Factor this polynomial expression.

x3 - 64

a. (x + 4)(x2 + 4x + 16)
b. (x - 4)(x2 + 4x + 4)
c. (x + 4)(x2 + 4x + 4)
d. (x - 4)(x2 + 4x + 16)

Difference of 2 perfect cubes

a^3-b^3=(a-b)(a^2+ab+b^2)

x^3-4^3=(x-4)(x^2+4x+4^2)
(x-4)(x^2+4x+16)

last one is correct

Letter a i would say

The answer would be 27 because assuming that each package has 1 bar of soap and 1 tube of toothpaste, after 27 packages they would run out of toothpaste