Choose all that apply!!!: . Show your work on your study guide!: D. MENTAL MATH!: D. SHOW YOUR WORK!: 7. Show your work!: 23. Show Your Work!: 22.03. What is a LETTER called in an equation? : Variable. What's the right way to write this statement as an equation?45% of u is 60.75: . Find the equivalent expression for:4x: . Find the equivalent expression for:x3: x â‹… x â‹… x