Question 549927
Here the formula is

Tn= a+ (n-1)d
so, for nth term we need to know first term and d.
1. d=4, a14=46 

here n=14, tn= 46 and d=4
so,

46 = a+(14-1)*4 = a+13*4
46= a+ 52
so, a= -6

so, nth term is Tn= -4 +(n-1)4
or,
Tn= -4+4n-4
Tn= 4n-8
or
an= 4n-8

Tn and an are notations for nth term only.
in the same way we can do other parts of this also.