Answer:
40 yards
Explanation:
Pythagorean theorem: a² + b² = c²
Using this, let's set the length as x.
42² + x² = 58²
Simplify.
1764 + x² = 3364
Subtract 1764 from both sides.
x² = 1600
Take the square root.
x = 40
Thus, the length she would swim would be 40 yards.