Question

1. $-r - 10r$

Explanation:

Step1: Identify like terms

The terms \(-r\) and \(-10r\) are like terms (both have the variable \(r\) with degree 1).

Step2: Combine like terms

To combine like terms, we add their coefficients. The coefficient of \(-r\) is \(-1\) and the coefficient of \(-10r\) is \(-10\). So we calculate \(-1 + (-10)\) and multiply by \(r\).
\(-1+(-10)=-11\), so \(-r - 10r=(-1 - 10)r=-11r\)

Answer:

\(-11r\)