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(There is a diagram showing a rectangle with one side labelled x+4 and another labelled x+6)Area = (x+4)(x+6)63m^2 = x²+10x+240 = x²+10x-390 = (x-3)(x+13)
x-3=0 so x=3x+13=0 giv...

Start with the name and addressThe traditional greetings and pleasantriesRespond to anything mentioned in the question. For example did they mention something about their family or ask you a question?In t...

Empirical formulaThe empirical formula is a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms. To find this you require the mas...

Isotopes are atoms of an element with different numbers of neutrons. They have the same proton number, but different mass numbers. They have the same chemical properties, due to having the same number of ...

This question is assessing your knowledge of units and their conversion. Notice that the area units of the roll of card and the postcard are different, so it is important that before we carry out any calc...