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The law of supply and demand is one of the fundamental concepts of basic economics. It is the foundation on which several economic theories have been built. The law of demand states the higher the price o...

Generally, increasing the temperature increases membrane permeability. At temperatures below 0 ^oC the phospholipids in the membrane don't have much energy and so they can't move much, which mea...

3x + 5y = 1   (eq 1)
2x - 3y = 7    (eq 2)

Step 1 -  2* (eq 1) 

6x + 10y = 2  (eq 3)

Step 2 - 3* (eq 2)

6x - 9y = 21  (eq 4)

First you need write out the balanced chemical equation. You will often be asked about iron(II) ions reacting with maganate(VII) ions or with dichromate ions, therefore it is easiest to learn these two eq...

The table is a cylinder so we'll need to use the equation for this shape: A = πr²h

We're looking for the thickness of the table (which is the height) so let's rearrange this equation to ...