You drive 70 miles per hour but then slow your speed by 15 miles per hour. you then return to your speed of 70 miles per hour. which expression shows how your speed changed? -70 + 15 + (-15) 70 + (-15) + (-15) 70 + 15 + 15 70 + (-15) + 15

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

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