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Find an equation of the curve with parametric equations x=3sin(A) and y=4cos(A), in the form bx^2+cy^2=d.

x²=9sin²(A) and y²=16cos²(A)Since sin²(A)+cos²(A)=116x²+9y²=16 x 916x²+9y²=144

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Consider the role of social class in Agatha Christie's 'Death on the Nile'.

Here is an essay template for a GCSE, A-Level or undergraduate essay. For the GCSE level, we will follow P.E.E. (point, evidence, explanation) structure, for the A-Level, we will add ‘contextual’ detail t...

Answered by Anna C. • English tutor

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What is a control in an experiment?

A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable. This increases the reliability of ...

Answered by Alessandra P. • Biology tutor

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What is meant by a reducing agent?

A reducing agent is oxidized. This means that it donates electrons to another substance, thus reducing it. Fe2+ to Fe3+ represents oxidation. Fe2+ could be a reducing agent.

Answered by Jools G. • Chemistry tutor

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Describe the changes in the lungs during inspiration

During inspiration, the intercostal muscles contract, moving the sternum up and out. This increases the thoracic volume, hence decreasing the pressure. The pressure gradient set up causes air inflow from ...

Answered by Dhaval N. • Biology tutor

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