Factor completely x8 − 81.

(x4 − 9)(x4 + 9)
(x2 − 3)(x2 + 3)(x4 − 9)
(x2 − 3)(x2 + 3)(x4 + 9)
(x2 − 3)(x2 − 3)(x4 − 9)

Option C, (x2 − 3)(x2 + 3)(x4 + 9)

Step-by-step explanation:

x^8 - 81 factors as (x^4 - 9)(x^4 + 9)

(x^4 - 9)(x^4 + 9) factors as (x^2 - 3)(x^2 + 3)(x^4 + 9)

 Option C, (x2 − 3)(x2 + 3)(x4 + 9)

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

4/6 = 2/3

so it should take 3/3 hours per man. so 9 hours is the answer 3*3 =9

step-by-step explanation: