rite an equivalent expression by distributing the " - " sign outside the parentheses. \[ -(3 y+7.7 z)-7.9 \]

When you distribute the negative sign outside the parentheses, you change the signs of the terms inside. So, let's break it down: \[ -(3y + 7.7z) - 7.9 \] becomes \[ -3y - 7.7z - 7.9. \] Now everything is negative! This results in a neatly formatted expression ready for whatever mathematical adventure you have next! One common mistake when distributing the negative sign is forgetting to change the sign of every term within the parentheses. Remember, if there's a negative sign in front of the parentheses, all the signs inside must flip! So check twice to avoid those sneaky errors!