If 8 apples cost $5.84, what will be the cost of 18 apples (assuming an equal rate)? use a proportion to solve this problem and round your answer to the nearest penny.

8 apples $ 5.84

18 apples x

x= (18*5.54)/8 = 12.47

Answer is $ 12.47.

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