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Diagram of triangle with a right angleTwo sides on the right angle = a & b
a² + b² = c²
Therefore, if a = 5 and b = 12: then c = 13.

METHOD 1:Required Formula: Percentage Change(%)=100x(Final value -Initial value)/(Initial value) Percentage Change = 5% (this is positive 5% since Sarah has a price raise, if Sarah had a 5% wage decrease ...

2t^-2

In an office there are twice as many females as males. 1/4 of the females wear glasses. 3/8 of the males wear glasses. 84 people in the office wear glasses. Work out the number of people in the office.Let...

The imperfect tense conveys an action that happened in the past. However, this differs from the perfect tense as imperfect implies the action was continuous / happened regularly in the past. It can be com...