A father requires his son to do chores for 4 to 6 hours a week. If the son wants to do chores daily, how many hours per day is this (in interval notation)?

I believe the answer is the first one [4/7 ,6/7].

I used process of elimination

The fourth one is unreasonable and impossible.

The third one is more than the weekly requirement.  

The second one is the weekly requirement.

The first one would have to be in reason because of that.

41*67/2=1373.5

step-by-step explanation:

i just used a calculator

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb