Final answer:
The kite is 7.62 meters up in the tree.
Step-by-step explanation:
To find the height of the kite up in the tree, we need to subtract the length of the string that is on the ground from the total length of the string. The total length of the string is 25 meters and after pulling it tight, it measures 57 feet on the ground. Firstly, we convert the feet measurement to meters. Since 1 meter is approximately 3.28 feet, we can multiply 57 feet by 1 meter/3.28 feet to get 17.38 meters. Then we subtract this length from the total length of the string to find the height of the kite, which is 25 meters - 17.38 meters = 7.62 meters. Therefore, the kite is 7.62 meters up in the tree (option c).