Answer:
4x+1
Step-by-step explanation:
The area is 12x2 + 3x in
The length is 3x
Formula is A=L*B
12x2 + 3x=3x*B
Divide both side by 3x
12x2+3x divide by 3x=B
4x+1=B
The express for the width is 4x+1
Please mark as brainliest
Answer:
I believe it would be division.
Step-by-step explanation:
Sorry if its wrong, i havent done a question like this in a long time, please forgive me!
Oof this one is hard I think it’s 20 mm but I’m not sure
Answer:
7 or 
Step-by-step explanation:
Each triangle has the surface area of 1.5, because 1 
3 = 3 / 2 = 1.5. You divide by two because it is half a rectangle instead of a full one. You multiply by four which would get you 1.5 4 = 6. The square in the middle has the surface area of 1 because 1 1 = 1. So you would get 7.
