Answer:
solution:
If ║v(t)║= 1, for all t >= a, then the parameter t corresponds to arc length.
║v║=║r'║*║v║=√4t^2+16t^2+64t^2=√84t=2√21t is not equal to 1,
so it doesn't use arc length as a parameter.
Consider s = √21t
r(s) =(s/√21, 2s/√21, 4s/√21) for √21 <=s<=16√21
║r'(s)║=(1/√21)*√1+4+16
= 1
so now it does use arc length as its parameter.
Answer:
The letter is choose from set of vowels i.e. {a, e , i , o, u}.
Step-by-step explanation: