exam Maths Puzzle Numerical Ability

Find two consecutive positive intergers such that the sum of their square is 85

This problem has confused me by adding in square, how do I go about solving this type of problem?

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exam Other Question

In 2010 the population of the world is predicted to be 6.8 billion, by 2050 the population is predicted to be 9.4 billion I need to write an inequality equation to show this trend. edward is a salesman. his annual base salary is $30,000. he receives 2.5% commission on each sale, if he wanted to make $55,000 how much would he have to reach in sales?