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Label the equations (1): y=x/2 + 2 and (2): 2y+3x=12. Firstly, multiply equation (1)by 2, this will give you (1a): 2y=x+4, then, substitute (1a) into (2). This gives you (x+4)+3x=12. Therefore, 4x+4=12. 4x=1...

First, we need to factorise the equation on the left hand side, this can be done by finding two numbers that add together to make the 'b' coefficient (-9) and multiply to make the 'c' coefficient (20). This ...

The is a layer of harder rock on top of soft rock. The softer rock underneath erodes more quickly, undercutting the hard rock. This leave the hard rock to over hang. Eventually the soft rock is undercut so m...

Economies of scale is the concept that as a company increases its output, cost per unit will decrease as fixed costs are spread over a larger number of units. This is known as internal economies of scale and...

There is no simple answer for this! In short, the gender of nouns in French must be learnt, rehearsed and repeated until you can't hear the word any other way. Although there are some shortcuts for this, for...