book Maths Puzzle Numerical Ability

Find the center of the circle.
x^2+y^2-4x-12y+30=0

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book Other Question

Solve for x

x=(.31429x)+24000 Solve this problem.

Office space. The length of a professor`s office is x feet, and the width is x + 4 feet. Write a polynomial that represents the area. and find the area if x = 10ft.