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How can a city become sustainable?

Sustainability in cities involves improving and developing cities whilst preserving the environment and resources. Sustainable cities must control the use of resources. This can be done by improving the effi...
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Answered by James A. • Geography tutor
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Amanda and Wim share some money in the ratio 2:5. Wim receives £115. Calculate how much money was shared?

First, you need to find value of one part . We can see that Wim who has a share of 5 parts gets £115. So, 5 parts is equivalent to £115. Therefore, value of each part is 115/5 = £23. Now, adding the ratios 2...
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Answered by Saeideh N. • Maths tutor
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Compare and contrast the structures of Diamond and Magnesium in terms of the position and interactions of particles within the substance. Comment on how this is reflected in their properties.

Diamond is a giant covalent structure of Carbon atoms in which every atom makes 4 covalent bonds , each with another Carbon atom, forming a regular tetrahedral structure. This results in a very hard substanc...
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Answered by Poppy H. • Chemistry tutor
5688 Views

rearrange c=(4-d)/(d+3)

c = 4-d/d+3 x d+3 = c(d+3)= 4-d = cd +3c= 4- d = cd+d=4-3c. = d(c+1)=4-3c = d= 4-3c/c+1
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Answered by Verina Y. • Maths tutor
7887 Views

What is the best way to answer a source question?

When you look at or read a source, you need to bear in mind the following,Source : where does it come from? Make sure to look at the date and think about who wrote it.Objective : why was it written / produce...
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Answered by Chloe D. • History tutor
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