Can someone help me with this question please

3. A kite 100 ft above the ground moves horizontally at a speed of 8 ft/s. At what rate is the angle between the string and the horizontal decreasing when 200 ft of string has been let out? Find the linearizalion LL!) of the inetion at a. a) x) - Z/sz - 5. a - 3 b) )"(x)='/25-Jr3I . 0-3