Question 426920
In order to find the 6th term of the sequence, you must replace the n with 6 and solve.  
Tn=4(6)-7
Tn=24-7
Tn=17
So the answer is 17.
In order to find out if -356 is a member of the sequence Tn=4-5n, substitute Tn with -356 and solve for n.  If n is a whole number, then the answer is yes.  If it not a whole number, then the answer is no.
-356=4-5n
-4    -4
-360=-5n
/-5  /-5
72=n
So the answer is yes, -356 is a member of the sequence.