If the area of a circle is represented by A=πr2,what equation represents the length of the radius? pa help po plss

Combine like terms to make a simpler expression 3z+z

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?