Factor the polynomial:

a^4+2a^3-a-2

(a-1) *(a^2 +a-1) (a+2)

Step-by-step explanation:

a^4+2a^3-a-2

Lets factor by grouping

a^4-a +    2a^3-2

Factor out an a from the first group and a 2 from the second group

a(a^3 -1)  +2(a^3-1)

Factor out (a^3-1)

(a^3-1)(a+2)

We need to recognize that a^3-1 is the difference of cubes

(x^3-y^3) = (x-y) (x^2+xy+y^2)

Let x=a  and y=1

(a-1) *(a^2 +a-1) (a+2)

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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a

step-by-step explanation:

u take $30 minus $24. the answer/original($30)