mean = (4 + 81)/2 = 85/2 = 42.5
2/3 x 81 = 54
2 x 40.5 = 81
81. (9 to the power of 2 = 9 x 9).
Because: (9-x)(9-x) = 81-18x+x^2
mean = (4 + 81)/2 = 85/2 = 42.5
88
2/3 x 81 = 54
2 x 2 x 2 x 3 x 3 = 72 3 x 3 x 3 x 3 = 81
81 = 3 x 3 x 3 x 3 100 = 2 x 2 x 5 x 5
In every circle . . .Area = (pi) x (radius)2Diameter = 2 x radiusCircumference = (pi) x diameterIn this circle, Area = (pi) R2 = 81R2 = 81/piR = sqrt( 81/pi )Diameter = 2 x sqrt( 81/pi )Circumference = (pi) x 2 x sqrt( 81/pi ) = 2 x sqrt( 81 pi ) = 18 sqrt(pi) = 31.9042 (rounded)
2 x 40.5 = 81
1 x 81, 3 x 27, 9 x 9
162
81. (9 to the power of 2 = 9 x 9).
2 x 19 = 38 3 x 3 x 3 x 3 = 81
Because: (9-x)(9-x) = 81-18x+x^2