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What is diffusion? (GSCE: OCR, Edexcel, AQA)

Definition : diffusion is the spreading out of particles from an area of high concentration to an area of low concentration The theory: Diffusion, is the scientific description for the gradual movement of pa...
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Answered by Ned F. • Biology tutor
14330 Views

How would you solve a quadratic equation by factorising?

Solve the equation : x 2 - 8x + 15 The first step is to factorise the quadratic equation. 1. You must find two numbers which will add to give -8 and multiply to give 15. The numbers that would do this are -5...
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Answered by Angelin G. • Maths tutor
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What are pathogens and how do they cause disease?

Pathogens are microorganisms that can cause disease. Pathogenic bacteria make us ill in 2 way: 1) by damaging body cells 2) releasing toxins. Pathogenic viruses invade body cells where they use the cellular ...
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Answered by Golnoush G. • Biology tutor
14875 Views

If (2/3)^n=〖(3/2)〗^2 what is the value of n

Reciprocal is when you interchange the numerator (the number on top in a fraction) with the denominator (the number at the bottom in a fraction). The numerator, is now the denominator and the denominator is ...
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Answered by Gift W. • Maths tutor
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A quarter circle represents a piece of land. The length of the straight sides is 100 ft each. If the land is enclosed by a fence, what is closest to the length, in feet, of the fence?

Perimeter of a quarter circle = (2πr)/4 r = 100ft P = (2πr)/4 = (2×3.14×100)/4 = 157 Because we are calculating the length of the fence – as the fence goes around the land – for the two straight sides - the ...
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Answered by Gift W. • Maths tutor
7607 Views