exam Maths Puzzle Numerical Ability

how do you grade(x-4)^2+y^2+9?

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walt made an extra $9000.00 last year from a part time job. he invested part of the money at 10% and the rest at 7%. he made a total of $780.00 in interest. how much was invested at 7% A boat can travel at 10 mph in still water. It travels 75 miles downstream with the current in the same time it travels 25 miles upstream. What is the speed of the current?