exam Maths Puzzle Numerical Ability

can I use this as a straight line graph

Straight-line graphs help me, at work, project weekly goals that correspond with a yearly target. We track various things such as product

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What type of solution do you get for quadratic equations where D<0? Give reasons for your answer. Also provide an example of such a quadratic equation and find the solution of th Im not sure how to solve problems by rationalizing the denominator