exam Maths Puzzle Numerical Ability

Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if

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Determine the point A(x,y) so that the points A(x,y), B(0,3), C(1,0), D(7,2) will be a vertices of a parallelogram. Thanks for any help. A different insect population is modeled by  where  represents the number of insects in the population at time , and  represents time measured in da