I am not sure if this is trig but the question is
Tn = 2n + 3
write the first five terms of the sequence
No it's not trig.
It means to replace n by 1, then by 2, then by 3, then by 4, then by 5.
Tn = 2n+3
Replacing n by 1:
T1 = 2(1)+3 = 2+3 = 5
Replacing n by 2:
T2 = 2(2)+3 = 4+3 = 7
Replacing n by 3:
T3 = 2(3)+3 = 6+3 = 9
Replacing n by 4:
T4 = 2(4)+3 = 8+3 = 11
Replacing n by 5:
T5 = 2(5)+3 = 10+3 = 13
and the sequence is
T1, T2, T3, T4, T5
or 5, 7, 9, 11, 14
Edwin