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R and B are directly proportional variables. When R = 9, B = 3. What does R equal when B = 14?

R and B are directly proportional variables. Therefore, we can write a relationship between them as R = kB where k is a proportionality constant. We can rearrange this equation to calculate the value of k: R...
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Answered by Liban W. • Maths tutor
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Simplify: ((3x^2)-x-2)/(x-1).

Firstly, simplify the numerator by factorising the quadratic, to give a numerator of (3x+2)(x-1). Now, divide through by (x-1), to give (3x+2).
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Answered by Oscar K. • Maths tutor
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What is the name of the compound with the formula CH3CH2CH(OH)CH3, and what is the name of its functional group?

The compound's name is butan-2-ol: four carbons in the chain means the compound has the but- prefix; the alcohol group is on the second carbon, so the compound has the -2- suffix; and the functional group is...
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Answered by Oscar K. • Chemistry tutor
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Explain the chain rule of differentiation

The chain rule can be used to find more complex derivatives.For example, in the case of: y = (5x + 2) 5 To find the derivative in the ordinary fashion, one would need to expand the brackets to:y=3125x 5 +625...
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Answered by Toby H. • Maths tutor
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'Describe how journalists may approach the issue of pupil behaviour in British schools differently from sociologists' [4 marks]

To answer this question, we identify the action ( to describe ), the focus ( journalist versus sociologist approach on pupil behaviour ) and the argument ( that sociologists are systematic whilst journalists...
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Answered by Eva S. • Sociology tutor
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