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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exam Other Question

write the equation of the line with slope -1/2 and y-intercept (0,3)

Thanks for all your help Smith bicycled 45 miles going east form Durango, and Jones bicycled 70 miles. Jones averaged 5 miles per hour more than Smith, and his trip took one-half hour longer than Smith�s. How fast was each one traveling?