9/40 in a decimal what's the answer

Factor completely. x^8 - 1/81 a) (x^4 + 1/9)(x^2 + 1/3)(x^2 - 1/3) b) (x^4 - 1/9)(x^2 + 1/3)(x^2 - 1/3) c) (x^4 + 1/9)(x^2 - 1/3)2

Use the distributive law to multiply. 3(4x + 5y + 6)

Which statements regarding efg are true? check all that apply.