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Express (16x+78)/(2x^2+25x+63) as two fractions

Firstly factorise the denominator to get (2x+7)(x+9). Then make the fraction equal to the seperate fractions with constants. E.g 16x+78/2x^2+25x+63=A/(2x+7)+B/(x+9). then multiply accross by the denominator ...
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Answered by Georgia D. • Maths tutor
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Briefly outline and evaluate the cognitive interview.

A cognitive interview is a technique employed by police officers to conduct questionning of a witness following an event, in order to improve the memory recall of the event. There are 4 main techniques used ...
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Answered by Hannah W. • Psychology tutor
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25.00cm3 of sodium hydroxide was pipetted into a conical flask. It was titrated against 0.10mol/dm3 hydrochloric acid. The mean volume of acid needed was 24.00cm3. Calculate the concentration of sodium hydroxide used in the titration.

First write out the chemical equation: ​​​​​​ HCl + NaOH -> NaCl + H 2 0 Next construct a table with the information we have and in what units. Next write out what calculation triangle we need: Number of ...
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Answered by Matthew B. • Chemistry tutor
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Write a balanced equation for the reaction between NaOH and sulfuric acid. A conical flask contains 25cm^3 of 0.124M NaOH, a burette contains 0.0625M sulfuric acid. Find the minimum amount of acid required to completely react with the NaOH in the flask.

first, consider balanced equation: consider reaction occuring: NaOH + H 2 SO 4 --> Na 2 SO 4 + H 2 O (neutralisation) ions present in each reactant: NaOH: Na + , OH - H 2 SO 4 : 2H + , SO 4 2- - SO 4 2- r...
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Answered by Harriet M. • Chemistry tutor
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To what extend did royal and noble patronage cause cultural change in the years 1509-88?

(Please note this is an essay question, below is only a sample introduction) Royal and noble patronage was the practise of giving support to those such as poets, artists and musicians who worked in the arts ...
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Answered by Amy B. • History tutor
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