exam Maths Puzzle Numerical Ability

Find the center and the radius of the circle give by

x^2+8x+y^2+6y-24=0

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exam Other Question

The sum of Juan's age and Pedro's age is 44 yrs. Juan is three times as old as Pedro was when Juan was half as old as Pedro will be then Pedro is three times as old as Juan was whe |_x_|< 5
8

Can you please help me with this linear inequality...i need some help on how to start solving problems like these...thank you