9^7/9^-7 please help!
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Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Is the power produced directly proportional to the wind speed, give reasons for your answer?