What is the constant ratio between consecutive terms in the following sequences: g) 7 1/2; 8; 8 1/2; 9; ... h) 3.05 mm; 3.1 mm; 3.15 mm; 3.2 mm; ...?

$\frac{8}{7.5} = \frac{16}{15}$  
$\frac{8.5}{8} = \frac{17}{16}$

Since $\frac{16}{15} \neq \frac{17}{16}$, there is no constant ratio. This is an arithmetic sequence with a constant difference of 0.5.  
There is $\boxed{\text{no constant ratio}}$.

$\frac{3.1}{3.05} \approx 1.01639$  
$\frac{3.15}{3.1} \approx 1.01613$

Since $1.01639 \neq 1.01613$, there is no constant ratio. This is an arithmetic sequence with a constant