Practice for lesson 1 of 18, 9 problems
Practice: Algebraic expressions: why we use letters
Algebraic expression practice problems with solutions: translating words into expressions, evaluating expressions, values that make an expression undefined, and formulas from real situations.
Review the lessonWork each problem out on paper before you open the solution. If your answer is off, compare the steps and find where you went wrong. If a problem stops you cold, go back to the lesson: every set links to it.
Warm-up
Level up
Word problems
Quick check
Practice 8Quick check
What is the value of \(-x^2\) when \(x = 4\)?
The exponent applies to \(x\) first: \(-(4^2) = -16\).
Practice 9Quick check
Which expression means "three times the difference of a number and 7"?
"The difference" is computed first, so it needs parentheses.
All done?
If you got most of them right, you're ready to move on. If not, reread the lesson and try the ones you missed again in a few days.