1. The problem statement, all variables and given/known data I've done this problem about 5 times, several different ways following many different examples but I can't seem to find the right answer or even figure out how they got one of the answers (y answer is given) 3. The attempt at a solution r(t) = (1+4*sqrt(t), t5-t, t5+t) s(t) = P0 + tv (P and v are vectors) s(t) = r(0) + tr1(0) r1(t) = (2/sqrt(t), 5t4-1, 5t4+1) r1(0) = ???? and this is where i get stuck because trying to substitute 0 in x equation will give you an undefined number...so i'm doing something wrong obviously...please help!!