The answer appears to be choice 3 because it resembles an exponential function.
But I might be wrong.
Hope this helps :)
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All proportions have <u>this</u> <u>form</u>:
, Where
is equal to
.
If
, it's <u>not</u> a proportion.
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Here we have two pairs of numbers:
40,10 and 32,8.
Written As a <u>proportion</u>, they <em>look like</em> :

Hope this made sense to you :)

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You just multiply the top and bottom numbers like it was two normal multiplication problems. Ex. 3/4x1/4=3/16 (3x1,4x4) But its different because you have to put them together to make a fraction (3/16).
The two angles given are vertical angles which mean they are the same.
x +40 = 60
Subtract 40 from both sides:
x = 20