This is an arithmetic progression with common difference, d= -5 and first term, a=8
Tn= a+(n-1)d
Tn= 8+ (n-1) * -5
Tn= 8+-5(n-1)
Tn= 8-5n+5
Explicit Formula: Tn= -5n+13
a14= -5(14)+13
= -70+13
= -57
You've got it right, it's A, 6n+2, n is an unknown number(or a variable) , product means multiplied