Step-by-step explanation:
[tex]\dfrac{15}{8}\\\\15\ \text{and}\ 8\ \text{are relatively prime numbers (LCD = 1)}.\\\\\text{That's why you can write it only as a mixed number}:\\\\\dfrac{15}{8}=\dfrac{8+7}{8}=\dfrac{8}{8}+\dfrac{7}{8}=1+\dfrac{7}{8}=1\dfrac{7}{8}[/tex]
