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The second and fifth terms of a geometric series are 750 and -6 respectively. Find: (1) the common ratio; (2) the first term of the series; (3) the sum to infinity of the series

x n = ar (n-1) (1) x 2 = 750 = ar 1 (2) x 5 = -6 = ar 4 divide second equation by first-6/750 = r 3 r 3 = -0.008r= -0.2Insert into first equation.750 = a * -0.2a = -3750Sum to infinite series = a(1/(1-r))(in...
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Answered by Henry P. • Maths tutor
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What is transcription?

Protein synthesis is the production of new proteins. This happens in two stages, transcription and translation Transcription - forming mRNA from DNA 1) The DNA section to be copied (gene) is unwound by helic...
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Answered by Rebecca H. • Biology tutor
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When does a past participle agree with its preceding object in French?

The straightforward answer is when the normal order is swapped, and the object comes before the past participle. This means that you would say "J'ai écrit une lettre", but you would talk about &quo...
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Answered by Daire T. • French tutor
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How does Percy Bysshe Shelley explore the theme of change in 'Ozymandias'?

Described as a mocking and sneering “King of Kings”, Shelley creates an arrogant and proud persona for the titular Ozymandias. This is further emphasised by the dscription of his statue as “vast” and "C...
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Answered by Hannah R. • English tutor
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Why are zinc and Scandium not transition metals?

A transition metal is defined as an element that forms a stable ion with incompletely filled d orbitals. Scandium forms a 3+ ion with no electrons in its d orbitals and zinc forms a 3+ ion with completely fi...
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Answered by Ellie O. • Chemistry tutor
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