Jack's average in math for the first nine weeks was a 90. The second nine weeks his average dropped to a 54. What is the percent decrease in his average from the first nine weeks to the second?

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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