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What is the signed area between the curve y = x^2 - 4 and the x-axis?

The curve y = x^2 - 4 is a parabola that crosses the x axis at x = - 2 and x = 2, so the area that we are looking for is the area within the parabola when y <= 0 and -2<= x <= 2. So we expect our ar...
Answered by • Maths tutor
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Explain one way in which starch molecules are adapted to its function in plant cells

Starch molecules are insoluble and therefore don't affect the water potentialThey are also large and therefore can't leave the cellThey are compact and can store lots of energy in a small amount of space
Answered by • Biology tutor
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A train is travelling at 50m/s. How long does it take the train to reach 60m/s if it accelerates at a constant rate of 0.5m/s^2? How many kilometres does it travel in this time?

The initial velocity, u, is 50 ms -1 The final velocity, v, is 60 ms -1 The acceleration, a, is 0.5ms -2 The question is asking us to find the time, t. The equation of motion linking u, v, a, and t is v = u ...
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Answered by Elena S. • Physics tutor
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How do I access top marks in an extended response for A-level religious studies?

Perhaps the most crucial piece of information you should remember when composing extended responses in essays is the importance of your own argument! Whilst you may spend the majority of your revision time w...
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How does phagocytosis occur in macrophages?

A macrophage attaches to a pathogen by the receptors on the pathogen and macrophage binding. The pathogen is then engulfed and a phagosome forms, where a vesicle surrounds the pathogen. A lysosome moves towa...
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Answered by Hamza M. • Biology tutor
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