9514 1404 393
Answer:
12.25
Step-by-step explanation:
The angle bisector divides the triangle sides proportionally, so we have ...
x/3.5 = 7/2
x = 3.5×7/2 . . . . multiply by the denominator
x = 12.25
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Additional comment
The proportion can be written 4 ways. I find it convenient to write it with the unknown value in the numerator. That way, the solution is found in one step: multiply by the denominator.
