9:54 PM Thu Feb 20 Emilio Mejia Felici... R. 4 Evaluate linear expressions Video \( 08: 29 \mathrm{~V} \) Evaluate the expression for \( r=0 \). Write your answer as a decimal or whole number. \[ 12-2 r= \] \( \square \) Submit Not ready yet?

When you substitute \( r = 0 \) into the expression \( 12 - 2r \), you essentially simplify it to \( 12 - 2(0) \). This means you are subtracting zero from twelve, which gives you a clear result: \( 12 \). So, the answer is \( 12. \) It's interesting to note that evaluating expressions like this is not just a math exercise; it’s similar to troubleshooting problems in everyday life. Just as you plug in values to see what results you get, in real-world situations, you input variables like time or resources to find out how different scenarios might play out.