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Firstly, we write down all the information we are given from the question into mathematical form.

This equation is 4a-b=38                                        The valu...

A giant metallic lattice – the crystal lattice of metals consists of regularly arranged  ions (NOT atoms) surrounded by a ' delocalised sea of electrons' that form the giant lattice. 

The...

The accusative word in a sentence is the direct object. It also appears after the use of these prepositions. 

für - For
um - Around/for/at (time)
durch - Through
gegen -...

aus - From
bei - At
mit - With
nach - To (a place) - after/past (time)
seit - Since
von - From
zu - To
gegenüber - Opposite
außer - Except for

Here we have two simultaneous equations with two unknowns. In order to solve this, we must first elimate one of the variables. 

To do this we will first make the coefficient (the number b...