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I would first get the student to find the elements on the Periodic Table, and work out how many valence electrons each atom had. Then I would get them to draw the structures of hydrogen and chlorine us...

x² + y² + 10x + 2y - 4xy = 10

Start by differentiating both sides by x, the terms not containing y are differentiated normally, x² becomes 2x, 10x becomes ...

As distance is equal to speed multiplied by time, the distance Paul has traveled is 90 multiplied by T, or 90T.
As Mary is making the same journey, she travels the same distance. The distance she...