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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...

(a)     (i)      testes;                                                                                                                                       
         (ii)     pancreas;            ...

Initially the air resistance (r) is low, and the force due to gravity (mg) is high. These forces are unbalanced so the skydiver accelerates downwards. (mg > r)As the velocity increases the force of air...