List All The True Statements

Question

In the explicit rule for an arithmetic sequence below, SELECT ALL STATEMENTS THAT ARE TRUE.

This is an explicit rule for a sequence where f(1) = 18.

This is an explicit rule for a sequence where d = -1.

This is an explicit rule for a sequence where d = 18.

This is an explicit rule for a sequence where d = 19.

This is an explicit rule for a sequence where f(1) = 19.

Answer 1

f(n) = 19n - 1

f(1) = 18 is true

this creates a sequence

18, 27, 56, ...

f(2) = 27

f(3) = 56

also backwards -1, --20, -39, -58 ...

f(0) = -1

f(-1) = -20

f(-2) = -39

f(-3) = -58

the distance between terms in the sequence is 19 not 18 or -1 , d=19

f(1) is 18 not 19

so 1st and 2nd to last are true. the rest are false.

Answer 2

f(1) = 18

d = 19