Urgent! 20 pts ball has a diameter of 9 in. it consists of 2 parts. the inside is a spherical core with a diameter of 6 in. surrounding the core is a layer of polyurethane. what is the volume of the polyurethane? use 3.14 to approximate pi. round to the nearest hundredth if necessary. enter your answer in the box.

volume of sphere = 4/3*pi*r^3

calculate inside and out side then subtract the 2

outside diameter = 9 radius = 4.5

4/3 *3.14 *4.5^3 = 381.51

inside diameter = 6, radius = 3

4/3 * 3.14 * 3^3 = 113.04

381.51 - 113.04 = 268.47 cubic inches

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b