10a≤−120

To solve the inequality \( 10a \leq -120 \), you can follow these steps:

1. Divide both sides of the inequality by 10:

\[ a \leq \frac{-120}{10} \]

2. Simplifying the right side gives:

\[ a \leq -12 \]

So, the solution to the inequality is:

\[ a \leq -12 \]

This means that any value of \( a \) that is less than or equal to \(-12\) satisfies the inequality.