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100=ab

P=2a+2b

P=2a+200/a

dP/da=2-200/a^2

dP/da=0 implies 2=200/a^2

a^2=100

a=-10,10

a is a length so t...

The movement of molecules from an area of high concentration to low concentration across a membrane using energy.

I strongly advise students to follow the PEEL approach.First you write your point, in a relatively short, focused and simple sentence. You proceed to offer the quote from the text that your point relates ...

At the beginning of their course most A-level students fall into the trap of thinking a good evaluation point is one which completely contradicts or negates their previous argument. That is not the case. ...

Supernormal profits are made when Total Revenue is greater than Total Costs. When no supernormal profits are made Total Revenue = Total Costs, (it therefore follows that Average Revenue = Average Costs).I...