If you're asking how this is possible,
Answer and explanation:
If Sandy and Allen's mother does the job in 5 hours
And Allen and Sandy's contributions completes the job in 2.5 hours
5 hours - 2.5 hours =2.5 hours
Allen and Sandy's contribution is half of the time it took only Allen and Sandy's mother= 2.5 hours
Therefore Allen and Sandy together will take 2.5×2 = 5 hours to complete the job alone without their mother
A similar example: if it takes one person 2 hours to peel 5 potatoes and it takes 1 hour to peel same number of potatoes if a second person helps, then this second person reduces the time used by 1 hour(50%) and would take 2 hours to complete the work.
All you have to do is simplify each term. And by doing so, you will get 4y^-4 + 2 - 1
35/4
4 goes into 35 8 times. Remainder will be 3
Carry a 0
4 goes into 30 7 times Remainder will be 2
Carry a 0
4 goes into 20 5 times.
The answer is 8.75
This is actually physics but the answer is:
1: light.
Hope this helps :)
Answer:
Dark matter is just matter whose particles do not absorb reflect or emit light and can't be seen directly. We know of its existence because of its effects on objects that we c a n see. It's density formula is 2.241×10⁻²⁷ kg/m³
Step-by-step explanation:
