a frame holds a picture that is 15 inches long and x inches wide. The frame border is 3 inches wide around the picture. what expression represents the are of the frame border

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  border area = 6x +126

Step-by-step explanation:

The dimensions of the picture with its frame will be ...

 (15 +2×3) long by (x +2×3) wide

The border area is the difference between the picture overall frame area and the picture area:

  border area = (15+6)(x+6) -(15x) = 21x +126 -15x

  border area = 6x +126

so then what are you asking?

step-by-step explanation: