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Solve the simultaneous equations 5x + y = 21 x - 3y = 9

To solve simultaneous equations we want to use only one variable so either x or y. Therefore we need to eliminate (get rid of) one of the variables .If you multiply x - 3y = 9 by 5 you will get 5x - 15y = 45...
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Answered by Amelia H. • Maths tutor
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Describe how water moves from the roots to the leaves

The xylem tissue that runs from the roots to the leaves draws water up from the roots as water evaporates from the leaves. This process is called transpiration it is how water is replaced when water evaporat...
Answered by • Biology tutor
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The directors of a well-known food manufacturing PLC have announced that they are moving production from the UK to Europe in order to reduce costs. This will result in the loss of 115 jobs. To what extent is this decision likely to benefit the business’

A stakeholder is any person, organisation, social group, or society at large that has a stake in the business. Thus, stakeholders can be internal or external to the business. With a large decision such as mo...
LM
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What are monoclonal antibodies and how are they used in treatment?

Monoclonal antibodies are antibodies artificially derived from a single B cell clone (i.e. specific antibodies)An animal (typically a mouse) is injected with an antigen and produces antigen-specific plasma c...
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Answered by Maxime G. • Biology tutor
1950 Views

How should I approach answering moles calculation questions?

The key to answering any moles calculation question in chemistry is working out which equation you need to use. Generally, if moles are involved it will be moles = volume x concentration or moles = mass/RFM....
JS
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