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Five numbers have a mean of 9.4 . Four of the numbers are 3, 5, 10 and 12. Work out the range of the five numbers. ( 4 marks )

9.4 =( 3 + 5 + 10 + 12 + x ) / 5=> 9.4 x 5 = 30 + x=> 47-30 = x=> 17 = x

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Translate the following: 'de hac re diu locuti, reges fratribus imperaverunt ut pro urbe eorum pugnarent'

Translation: 'Having talked on this subject for along time, the kings ordered the brothers to fight for their [own] city'.Explanation: This sentence may throw you off by the first phrase, ho...

Answered by Lara W. • Latin tutor

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Solve this simultaneous equations, clearly showing all of your workings: x^2 + 2y =9, y - x = 3

Equation 1: x²+ 2y = 9Equation 2: y - x = 3
Rearrange equation 2: y = 3 + x
Substitute y = 3 + x into equation 1x² + 2(3 + x) = 9x² + 6 + 2x = 9x² + ...

Answered by Ella-May J. • Maths tutor

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Why do simple covalent molecules compounds have low melting and boiling points?

Define:A simple covalent compound consists of a small number of non-metal elements covalently bonded together. (1)For example, H2O , CO2, O2. (1)Relate to MP/BP: The small molecules have only weak intermo...

Answered by Sam B. • Chemistry tutor

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