When camping alone, Mr. Adams uses all of the water in the storage barrel I. 12 days. If mrs. Adams caps with him, they use all the water in 8 days. In how many days will mrs. Adams use the water if she camps alone?

Answer:

24 days

Explanation:

for Mr.Adams

12 days ---> 1 barrel of water

1 days ---> 1/12 barrel of water

8 days ---> [(1/12)*8] = 8/12 barrel of water

For Mrs Adams in 8 days:

she uses: 1 - 8/12 = 4/12

If she camps alone:

she uses 4/12 in 8 days

to use full:

(4/12)*3  barrels in  (8*3) days

1 barrels in 24 days

She can therefore use 24 days if she camps alone.

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option