Let us solve the part d.
The given sequence is
Please note that 3 and a half is basically 3.5
The standard explicit formula for an arithmetic sequence is given by
Where aₙ is the nth term, a₁ is the first term and d is the common difference
The common difference is basically the difference between any two consecutive terms
d = 4 - 3.5 = 0.5
d = 3.5 - 3 = 0.5
So the common difference is 0.5
The first term in the sequence is 3
So the explicit formula for an arithmetic sequence becomes
Now to find the 16th term we will simply substitute n = 16 in the above formula.
Therefore, the 16th term of the sequence is 10.5.