Answer:
[tex]\frac{7}{10} y[/tex]
Step-by-step explanation:
To add fractions with the same denominator, simply add the numerators:
[tex]\frac{a}{b} + \frac{c}{b} = \frac{a+c}{b}[/tex]
So:
[tex]\frac{3}{10} y+\frac{4}{10} y=\frac{7}{10} y[/tex]
