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How is the circulatory system is adapted to give oxygen to the tissues and remove waste products?

The circulatory system is described as being "dual", which means that blood passes through the heart twice for each complete circuit of the body, once to the lungs, and once to the rest o fthe body...
AP
Answered by Andrew P. • Biology tutor
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A car's speed changes from 10m\s to 40m\s in 10 seconds. What is its acceleration?

Change in velocity is 30m/s Acceleration is equal to the change in velocity / time taken a = 30/10 = 3m/s 2
IR
Answered by Isabelle R. • Physics tutor
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How do you choose quotations, and how do you use them in a paragraph?

Mainly AQA Specification A01 is a crucial part of the marking scheme so it is important that you come to grips with it effectively. It looks at your ability to critically use textual references and quotation...
SD
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Write (x-2)(x+4)=10 in the form ax^2 + bx + c = 0 and work out the values of a, b and c

We should begin by multiplying out the brackets. Firstly, multiply each term in the first bracket with the first term in the second bracket: x times x equals x 2 and -2 multiplied by x is equal to -2x. Next,...
TC
Answered by Thomas C. • Maths tutor
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White paint costs £2.80 per litre. Blue paint costs £3.50 per litre. White paint and blue paint are mixed in the ratio 3 : 2 Work out the cost of 18 litres of the mixture.

3:2 means there are 5 parts. So 18 litres can be divided by 5, and the price of each part worked out individuallly. 18 / 5 = 3.6 To work out how much the white paint costs: 3.6 x £2.80 = £10.08 £10.08 x 3 (a...
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Answered by Sophia H. • Maths tutor
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