Final answer:
To find the missing length of the right triangle with legs of 4 mi and 3 mi, we can use the Pythagorean theorem. Plugging in the values, we get the missing length to be 5 mi.
Step-by-step explanation:
To find the missing length of the right triangle, we can use the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides. In this case, we have a triangle with legs of 4 mi and 3 mi. We can plug these values into the Pythagorean theorem formula: c = √(a² + b²), where a and b are the lengths of the legs and c is the length of the hypotenuse. Plugging in the values, we get c = √(4² + 3²) = √(16 + 9) = √25 = 5 mi. Therefore, the missing length of the right triangle is 5 mi, so the correct answer is a