(а+у) • 5=

To simplify the expression \((a + y) \cdot 5\), you can use the distributive property. This means you will distribute the 5 across each term inside the parentheses:

\[ (a + y) \cdot 5 = a \cdot 5 + y \cdot 5 = 5a + 5y \]

So, \((a + y) \cdot 5 = 5a + 5y\).