Answer:
7.5d
Step-by-step explanation:
The n th term of an arithmetic sequence is
[tex]a_{n}[/tex] = a₁ + (n - 1)d
where a₁ is the first term and d the common difference
Here a₁ = [tex]\frac{1}{2}[/tex] d, thus
[tex]a_{8}[/tex] = [tex]\frac{1}{2}[/tex] d + 7d = 7 [tex]\frac{1}{2}[/tex] d = 7.5d
