Answer:
the answer is x = 4
Step-by-step explanation:
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the area of the first shape is 4 times 12 which is 48 and the area of the second shape is 2 times 10 which is 20
48+20= 68 mi2
I added 8 on both sides to get 12=3x then I divided by 3 on both sides to get x=4
Isnt it letter D ? Not sure tho