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Maths A-level Question, Rates of change involving a cylindrical vessel.

What do we know (IN) dv/dt = o.4π(OUT) dv/dt = 0.2π(h) 0.5 Initial height of water in vessel is 2.25m Diameter = 4m a) Show that at time t minutes after that tap has been opened, the height h m of the water ...
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Answered by Zubin M. • Maths tutor
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Make h the subject of h-36=(3h+18)/i

First, multiply both sides of the equation by 'i' to remove the fraction: i(h-36) = 3h +18 Then, expand the bracket by multiplying 'i' by each of the terms inside (first h then '-36'). Make sure to keep the ...
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Answered by Rebecca T. • Maths tutor
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Factorise fully 27x^2 - 3

First, work out what number is a common factor of both terms - in other words what number 'goes into' both 27 and 3? 3 is a factor of both so put 3 outside the bracket. = 3( __ - __) Now work out what goes i...
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Answered by Rebecca T. • Maths tutor
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What is the difference between "ser" and "estar"?

Both "ser" and "estar" mean "to be". However they both have different purposes in Spanish. "Ser" is the verb used to to denote a permanent state of being, whilst &quot...
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Answered by Alicia B. • Spanish tutor
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Messenger RNA (mRNA) is used during translation to form polypeptides. Describe how mRNA is produced in the nucleus.

Messenger RNA is produced via the process of transcription. DNA is transcribed into mRNA using RNA polymerase. First, the double helix structure of the DNA unravels, and the hydrogen bonds break between the ...
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Answered by Akanksha J. • Biology tutor
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