Answer:
It is the third one because of formula I² + 2I*II + II²
In your case I = 4x and II = 3
Answer:
x=19
Step-by-step explanation:
First, you place the numbers in place of the variables in their relative positions using the pythagorean theorem:

Then you square the numbers that you currently have:

Then subtract 225 from both sides to isolate the x:

This gives you the equation:

Then take the square root of both sides which gives you:

Then round to the nearest whole number which gives you x=19
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It will take 52 hours they will go 416 miles