Me. james has a 6-square-foot bulletin board and a 12-square-foot bulletin board. she wants to cover both boards with index cards without gaps or overlaps. each index card has an area of 1/4 square foot. how many index cards does she need?

There are 72 index cards she needed.

Step-by-step explanation:

Since we have given that

Area of first bulletin board = 6 square foot

Area of second bulletin board = 12 square foot

Area of each index card is given by

So, Number of index cards needs for first bulletin board is given by

Number of index cards needed for second bulletin board is given by

Hence, Number of index cards she needed is given by

Therefore, there are 72 index cards she needed.

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

g

step-by-step explanation: