Each square on Olivia's chessboard is 21 square centimeters. A chessboard has 8 squares on each side. To the nearest tenth, what is the width of Olivia's chessboard? Olivia's chessboard is

Option 1: $30 an hour plus a nonrefundable deposit of $50 option 2: $20 an hour plus a nonrefundable deposit of $75 kyle is renting a jetski for the day. if he can rent the jetski in one hour increments, what is the minimum number of hours must he rent the jetski for option 2 to be a better deal then option 1?

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

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)