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Explain what is meant by the term "perfect competition"

Perfect competiton in a market is defined as being a set of conditions where markets have little to no entry or exit barriers. These may be natural or synthetic. An example of a natural barrier to entry is h...
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Answered by Lucas E. • Economics tutor
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How does the body's response to a second infection by a bacterial pathogen differ from the first? (3 marks)

faster response due to the presence of memory cells there are many more cells specific for this pathogen therefore clonal selection and expansion of B cells is quicker - antibody production is quicker theref...
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Answered by Beth T. • Biology tutor
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Explain the role of inorganic ions in the body.

The resting membrane potential of cells is maintained by the actions of Na+ and K+. A resting cell is impermeable to Na+ so the concentration of Na+ is greater outside the cell than in it. However the cell i...
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Answered by Callum D. • Biology tutor
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Find the stationary point of 3x^2+7x

dy/dx=6x+7 6x+7=0 x=-7/6 Sub back into original equation; y=98/6
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Solve the simultaneous equations; 3x+2y=11 and 2x-2y=14

2y=11-3x and 2y=2x-14 11-3x=2x-14 25=5x thus x=5 3(5) +2y=11 2y=-4 thus y=-2
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Answered by Harrie S. • Maths tutor
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