exam Maths Puzzle Numerical Ability

find the length of a radius of the circle x^2+y^2-4x-6y-5=0

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exam Other Question

Convert 20 miles per hour to feet per second A dentist invested a portion of $15,000 in a 7% annual simple interest account and the remainder in a 6.5% annual simple interest government bond. The two investments earn $1020 in interest annually. How much was invested in each account?