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Expand and simplify (x+5)(x+7)

Front - Outer -Inner -Last (FOIL) x X x = x^2x X 7 = 7x 5 X x = 5x5 X 7 = 35 7x + 5x = 12x x^2 + 12x + 35
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Answered by Ellie M. • Maths tutor
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Describe the acute effects of high altitude on the cardiovascular and respiratory systems

Decreased partial pressure of O2 in the air means that the diffusion gradient between the alveoli and surrounding capillaries is reduced. Hence there’s a decreased haemoglobin and oxygen association in the b...
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Explain how a leaf is adapted for photosynethesis

A large surface area for gaseous exchangea waxy cuticle prevents water lossthe spongy mesophyll layer has air spaces which allow for efficient gasious exchange Stomata allow gases to enter and exit the leafg...
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Answered by Ellie M. • Biology tutor
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Explain why creating a list of several instances of one element using something like my_list = [a] * 5 can result in strange behaviour

A good example for this would be>>> a = [0]>>> l = [a] * 5>>> l[[0], [0], [0], [0], [0]]>>> l[0][0] = 1>>> l[[1], [1], [1], [1], [1]] You can see how creating a l...
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Answered by Gustas M. • Python tutor
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find the derivative of f(x) = x^3 + 2x^2 - 5x - 6. Find all stationary points of the function.

Calculate the derivative using the standard rules, in particular (x n )' = nx n-1 . f(x)' = 3x 2 + 4x - 5 Stationary points are where the derivative is equal to 0, i.e. all x such that f(x)' = 0, so solving ...
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Answered by Gustas M. • Maths tutor
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