The equation x2 - 2x + y2 - 4y = 20 defines a circle in the xy-coordinate plane. What is the radius of the circle?
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How can i differentiate this equation?

What is the solution of the equation? 35√(x+2)3+3=27

The stem-and-leaf plot shows the heights in centimeters of teddy bear sunflowers grown in two different types of soil. soil a soil b 5 9 5 2 1 1 6 3 9 5 1 0 7 0 2 3 6 7 8 2 1 8 3 0 9 key: 9|6 means 69 key: 5|8 means 58 calculate the mean of each data set. calculate the mean absolute deviation (mad) of each data set. which set is more variable? how do you know?