book Maths Puzzle Numerical Ability

find an equation for a circle satisfying the given conditions

center(6,-5) passes through (1,7)

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book Other Question

Find all real solutions to the following equation.

Square root(symbol) x^2+3x+6=4

Thanks in advance
A population increased to P0e4 in the first four years. What is the growth rate of this population? [Hint: P(t) = P0ekt]