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Fold mountains form on convergent (or collision) plate boundaries. They push up layers of accumulated sediment in the sea into folds. Examples are the Himalayas and Andes. The layers of sediment are accum...

There are two solutions here which must be found. Both 2 red pens and 2 black pens being selected.
First the red pensIf the total number of pens is 11 and number of red pens is 3, the probability of ...

We should recall that two lines are parallel when they have the same gradient. We can see the gradient of a line by writing it in the form y=mx+c, which will make the gradient equal to the coefficient of ...

In French, a negative is formed with the words "ne" and "pas". These are placed either side of the main verb of the sentence, 'sandwiching' it. For example the sentence "Je sais&q...

Rearranging the second equation gives x=2y+1. Substituting this into equation 1 gives (2y+1)²+y²=13.Rearrangingthis and factorising the quadratic equation gives (5y-6)(y+2)=0, giving...