Irene wants to buy some fish and a package of fish food for her aquarium. each fish costs $15, and the fish food costs $10. if she needs to keep her expenses below $100, which inequality represents her situation?
a.) 15x < 100 + 10
b.) 15x > 100 + 10
c.) 15x + 10 < 100
d.) 15x + 10 > 100

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