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

I am trying to solve problem 10 on page 419. I do not understand how to find the base, when the area is already given in a triangle write an equation and solve the following:A reception costs $235 plus $6 for each guest.The total bill is $1081. How many guests attended?