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x : y = 7 : 4, x + y =88. Work out the value of x - y.

Here we use the ratios given to calculate the answer. First we sum add 7 and 4 to find total parts. 7 + 4 = 11. Then we divide 88 by 11. 88/11 = 8.This means we know that each part in the given ratio is 8...

Answered by Alice C. Maths tutor
4238 Views

How do I make an argument in an exam?

It's important to take a few minutes to quickly plan your argument in response to a particular question. You do not want to waste too much writing time doing this, but it is crucial to have a rou...

Answered by Rob M. English Literature tutor
5590 Views

A student carries out an experiment to determine the melting point of a waxy solid. She heats a sample until it melts, then measures and records its temperature as it cools down. Explain how the student could use her results to decide whether the waxy

...solid is a pure substance or a mixture.
Firstly, she would need to plot a graph of temperature against time. Temperature remains constant at the melting point. The graph will show whether the sol...

Answered by Lucy Erin S. Chemistry tutor
6974 Views

Describe how alterations to tumour suppressor genes can lead to the development of tumours.

Alterations to tumour suppressor genes such as their increased methylation, mutation in the genes, or an instance where the tumour suppressor genes are not being transcribed or expressed, results in rapid...

Answered by Lucy Erin S. Biology tutor
10415 Views

Explain the lock and key model of enzyme action, including how they are denatured.

An enzyme is a protein that functions as a biological catalyst by speeding up chemical reactions and remaining unchanged by the reaction. The place on an enzyme where the molecule binds is called the acti...

Answered by Lucy Erin S. Biology tutor
6743 Views

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