A gift box of cookies has 4 chocolate chip cookies and 7 peanut butter cookies. Use c to represent the cost of each chocolate chip cookie and p to represent the cost of each peanut butter cookie. Write and I simplify an expression that represents the total cost of 5 gift box sets.

If there are 4 chocolate chip cookies and 7 peanut butter cookies in each gift box, you will need to multiply the price, c/p, by the number of cookies. This will give you:

4c + 7p

Now if you wanna find how much 5 gift boxes cost, you'll need to multiply that expression by 5. Put parenthesis around 4c + 7p, and add a 5 before the first parenthesis. That will bring you to the

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