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Given the ratio of x : y is 7 : 4 and x + y = 88. Work out the value of x – y

7x = 4yx=4y/7If we insert this into our other equation.4y/7 + y = 8811y/7 =88y = 56As we knowx =4y/7X= 4*56/7 = 32Then we can work out the answer X - Y = 32 - 56 = -24
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Answered by Salih K. • Maths tutor
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If f(x)=(x^3−2x)^5 , find f'(x).

f(x)=(x 3 -2x) 5 If we look at this function, we can see that it can be split into two functions, one hiding in the other one. Because of that, to solve this problem we will need the Chain rule: f(g(x))' = f...
RS
Answered by Radovan S. • Maths tutor
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To what extent did the United States 'win' the Cold War?

How should we approach this question? You've got an hour. Let's look at the first five minutes.First, circle on the command term. "To what extent" questions are tricky. They requires you to argue t...
IW
Answered by Isabella W. • History tutor
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Give an account of RNA and its role in protein sythesis.

RNA is a single stranded molecule, composed of a ribose sugar phosphate backbone (as opposed to the deoxyribose sugar phosphate double-stranded DNA) and the bases, adenine, guanine, cytosine and uracil (inst...
AF
Answered by Anna F. • Biology tutor
1281 Views

What is the indefinite integral of xlog(x)?

The integral can be split into two different functions of x which is a hint that we must use the integration by parts method. The method is defined as ∫ uv’ dx = uv - ∫ u’v dx . If we let u = log(x) and v’ =...
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Answered by William H. • Maths tutor
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