I need HELP, please!
How do I show that the mid-points of 2 3D vectors coincide?
Also,
(a) The fifth term of an arithmetic progression is three times the second term, and the third term is 10.
Find (i) the first term, (ii) the common difference, (iii) the 20th term.
(b) The nth term, t(n), of a sequence is given by - t(n) = p + nq, where p and q are constants.
(i) Write down, in terms of p and q, the 6th term of the sequence.
(ii) Find, in terms of p and q, the sum of the first six terms.