I can’t figure the question out.

The dimensions are 23 feet by 46 feet.

Step-by-step explanation:

You can use an algebraic equation to solve this.

If the width is w then the length L = 2*w.

The perimeter = 2 *  the width + 2 * length , so

138 = 2*w + 2 * L

138 = 2*w + 2 * 2w

138 = 2w + 4w

138 = 6w

138/6 = w

23 = w.

So the width = 23 and the length = 2*23 = 46.

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