3. Nina has $20.14 in her purse. She buys lunch
for $9.67. How much does she have left?

Nina has $10.47 left.

Step-by-step explanation:

$20.14 minus $9.67 is $10.47

$10.47

Step-by-step explanation:

Nina has $20.14.If she uses $9.67 for lunch then she would be left with($20.14-$9.67) which is equal to $10.47

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