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Explain how bacteria can become resistant to antibiotics.

Sometimes, a chance mutation in bacterial DNA allows certain bacteria to become resistant to certain types of antibiotic. When an antibiotic is given, only the non-resistant strains of bacteria will be kille...
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Answered by Rachel A. • Biology tutor
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(x - 3)(x + 4) = 0 Solve for x

(x - 3)(x + 4) = 0 x=3 and x=-4
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Answered by Danayan L. • Maths tutor
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What are the differences between an introduction and conclusion in a history essay?

An introduction and conclusion are similar and important parts of any history essay. It is crucial though that you do not repeat yourself. An introduction directly addresses the essay question and clearly st...
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Answered by Therese R. • History tutor
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expand and simplify (x+7)(2x+4)

Using the F.O.I.L rule, standing for first, outside, inside, last, we would multiply out the relevant terms. to give: 2x^2+4x+14x+28. Once we have successfully multiplied out the brackets, we would identify ...
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Answered by Ed D. • Maths tutor
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I don't understand acceleration and how something can accelerate without speeding up.

For this we must take a step back and analyse the meaning of acceleration. Acceleration is a change in VELOCITY - this is very important. Velocity is speed in a particular DIRECTION. You may be confusing vel...
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Answered by Jana S. • Physics tutor
8043 Views