Please answer for 40 points :D

a. 12(15+x)

b. 15 feet by 12 feet

Step-by-step explanation:

a. 180 and 12x have a common factor of 12, so divide both by 12, but remember to keep the 12 as a factor, and then you'll have all of the factors, leaving 12(15+x)

b. 180 + 12x represents the total area including the original mural and the extension. The 12x is probably the extension, and since the width is x, the height is probably 12. That leaves the constant 180, which is the area of the original mural. Since we know that the extension and the mural have the same height, the original mural also has a height of 12. So, divide 180 by 12 and you'll have the other dimension of the mural, the width which is 15

b fifteen feet by 12 feet