To find the value of -8(5a + 9) when a = 3/5, we can substitute the value of a into the expression and simplify.
Let's plug in a = 3/5:
-8(5 * (3/5) + 9)
Now let's simplify:
-8(3 + 9)
-8(12)
This gives us:
-96
So, the value of -8(5a + 9) when a = 3/5 is -96.