There are 3 cups of water wasted every 24hrs.
How much is wasted in 1 week.
First we know that there are 24hrs in every day and 7 days in every week.
So there are 3 cups of water wasted every day(every 24hrs).
To find out how many cups of water are wasted in a week you would do:...

Let x be the number of packs of toothpicks.
We can re-write this as: 3x = 0.87.
We can then solve for x by dividing both sides by 3.
That is: 3x/3 = 0.87/3
this gives us: x = 0.29cents
Next we need to find out how much 10 pakcs of toothpicks costs.
This is the same as: 10x...

You can use elimination to solve this problem... To do this we can multiply one of the equations buy -1 to eliminate y and then we'd easily be able to solve for x.
That is: 4x-y=0 (3x-y=2)-1
This gives: 4x-y=0 -3x+y=0
Then add the two equations together...4x +(-3x)-y +y =...

To find the percentage you need to do: 52000/1200000 and multiply that by 100%.
That is: 52000/120000 = 0.043 X 100 = 4.3%
Gina

First we should try to simplify this by finding the LCM: 1/1-cosx + 1/1+cosX=
[1+cosx+1-cosx]/(1-cosx)(1+cosx). I got this by finding the LCM which is (1-cosx)*(1+cosx).
This simplifies to: 2/[1-(cosx)^2]...