(9x+5) - (4x-3) + 2(2x-7) - 4(5x+3) - (2x-8) + (7x-(-7))

X is a variable pls help

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Someone me what is the area of this figure? 18m 18m 8m 16m