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How does osmosis and diffusion work?

Osmosis and diffusion are two words used to describe the movement of molecules. Molecules are like people. They don't like to be squashed into small areas with lots of other molecules surrounding them. Molec...
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Answered by James D. • Biology tutor
5515 Views

How do you plan an answer during an exam?

Firstly, you have to find the method that works best for you. I'd suggest that you try a few out and then choose which you find the most helpful, and then use it for your revision and practice questions. I f...
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Answered by Eleni E. • History tutor
3849 Views

How do I differentiate (2x+1) / (3x^2 - 5)?

This is a typical example where the quotient rule is required to answer the question. This is clear because the function is made up of two other functions of x, one is the numerator and the other is the deno...
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Answered by Sophie T. • Maths tutor
5100 Views

In an arithmetic sequence, the first term is 2, and the fourth term is 14. a) Find the common difference, d. b) Calculate the sum of the first 14 terms, S14.

a) We have that a 1 = 2 and a 4 = 14, so the first thing that we can conclude is that the common difference, d, is positive, and that a 2 and a 3 are in between 2 and 14. We know that a 1 + 3d = 14. Substitu...
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Answered by Zhihong Z. • Maths tutor
4403 Views

Solve the simultaneous equations 2x - 3y = 7 and 3x + 4y = 2. Do not use trail and improvement.

[ 2x - 3y = 7 ] *3 = [ 6x - 9y = 21 ] [ 3x + 4y = 2 ] *2 = [ 6x + 8y = 4 ] [ 6x + 8y = 4 ] - [ 6x - 9y = 21 ] = [ 17y = -17 ] Therefore, y = -1. Substituting y = -1 into the original equations and solving fo...
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Answered by Elizabeth H. • Maths tutor
15102 Views