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What are depositional and erosional landforms?

Define Erosion is the process of wearing down by wind, water or other natural agents. It can dissolve rock, by weakening it or turning it into small fragments Deposition is the process by which sediment sett...
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Answered by Cosima G. • Geography tutor
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Evaluate ∫sin⁴(x) dx by expressing sin⁴(x) in terms of multiple angles

First we remember that sinθ can be expressed in terms of powers of z, where z=cos(θ)+isin(θ), using the following:2isin(nθ)=zⁿ-z⁻ⁿ and 2cos(nθ)=zⁿ+z⁻ⁿ so, [2isin(θ)]⁴=[z¹-z⁻¹]⁴ 16sin(θ)=(z)⁴(-z⁻¹)⁰+4(z)³(-z⁻...
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State the similarities and differences between eukaryotic and prokaryotic cells

Prokaryotic cells (bacteria) are exclusively unicellular whereas eukaryotic cells can display attributes of both multicellular and unicellular of a bigger and more complex structure. Eukaryotes are distingui...
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Answered by Dominic S. • Biology tutor
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An isosceles triangle ABC has a perimeter of 16cm. AB = x+3, AC = x+4. Calculate the area of ABC.

Find x.2(x+3) + x+4 = 163x + 10 = 16x = 2So: AB = 5cm, BC = 5cm, AC = 6cmThen use '0.5 x base x height' to find area.Base = 6Height use Pythagoras: 5^2 - 3^2 = x^225 - 9 = 16x = 40.5 x 6 x 4 = 12cm^2
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Answered by Amelie M. • Maths tutor
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How is a nerve impulse transmitted across a cholinergic synapse?

Action potential reaches pre-synaptic knob.This stimulates voltage gated Ca2+ channels to open and Ca2+ to diffuse in.This causes vesicles containing ACh to bind to the pre-synaptic membrane and release ACh ...
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Answered by Amelie M. • Biology tutor
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