It is three cuz when replace with three it is all equal:
3(2)-3=3
6-3=3
3=3
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Im thinking the answer is c
What question do you need help with
If the two triangles are similar you can use a proportion to solve for the length of the legs.

=

Now, you would cross multiply to get
4x=18
Now, you simplify that using the division property of equality.
You end up with
x=4.5
Therefore, the legs of the triangle with a base of 9 inches will each be 4.5 units long.