pls let me know how to do this.

23. Find a vector-valued function, using the given parameter, to represent the intersection of the surfaces given below. Surfaces Parameter z= x-ty- z=25 x = 5cos(8 Itt) 24. Evaluate the limit given below. 12 - 64 17 lim 3ti + k 1- 8\\ 12 - 8t t 25. Determine the interval on which the vector-valued function r(t) = 8e 'ite 'j + In(t -4)k is continuous.\f29. Find the curvature K of the curve given below. r(t) = ti + 4t-j + 8tk 65 a. V (65 + 6412)3 81 65 b. (65 + 8+2) 2 4 C. V 165+ 6412)3 8 d. V (65+ 64+2) 3 65 e. 8 (65+ 64+2) 3