Answer:
9.487.
Explanation:
To find the length of EF, we can use the distance formula. The distance between two points (x1, y1) and (x2, y2) is given by the following formula:
distance = √((x1 - x2)^2 + (y1 - y2)^2)
We can plug in the coordinates of the two points to find the length of EF:
distance = √((4 - 1)^2 + (-2 - 7)^2)
= √(3^2 + (-9)^2)
= √(9 + 81)
= √90
≈ 9.487
Therefore, the length of EF is approximately 9.487.