exam Maths Puzzle Numerical Ability

I didn't get how I am to get to were I need to graph it.
It asks me to Sketch the graph of each equation. If the graph is parabola, find its vertex. If the graphis a circle, find

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The square of 5 more than a number - let x represent the number then write an expression for the product 1)A jogger starts a course at a steady rate of 8 kph.Five minutes later,a second jogger starts the same course at 10 kph.How long will it take the second jogger to catch the first?