Answer:
both are reciprocals
Step-by-step explanation:
15.
[tex]\frac{5}{8}\cdot \frac{16}{20}\\\\=\frac{5}{8}\cdot\frac{8}{5}=1[/tex]
so they are reciprocals
17.
[tex]\frac{2}{3}\cdot\frac{12}{18}\\\\=\frac{2}{3}\cdot \frac{3}{2}=1[/tex]
so they are reciprocals
