A student scores the following marks in 10 tests 3,7,x,7,12,9,10,4,2,5
If the mean mark is 6, calculate the value of x.

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

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