Please help me Find the perimeter

C. 20x-5

Step-by-step explanation:

The perimeter is the sum of all side lengths.

4x-1+9x-1+7x-3

Combine like terms.

4x+9x+7x=20x

-1-1-3=-5

20x-5

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