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Hagrid
The answer to this question is 3. You need to derive a formula from the main formula of a trapezoid. To find the missing base b1 you just have to multiply the area by 2 then divide by the height which is 3 minus the given base. And you will now get the answer. 

Answer:

b1 = 3

Step-by-step explanation:

Trapozoid area formula: A = 1/2(h)(b1 + b2)

Plug in what you are given into the formula: 12 = 1/2(3)(x + 5)

Simplify: 8 = (x + 5)

x = 3

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