From the image, the problem states:

"I think of a number, take away 1, and multiply the result by 3."

To write this algebraically, let $x$ be the unknown number. Following the given steps:

1. Start with the number $x$.
2. Subtract 1: $x - 1$.
3. Multiply the result by 3: $3(x - 1)$.

Thus, the algebraic expression is:
$3(x - 1)$

Would you like a detailed explanation or more examples of similar problems?

Related Questions:

1. How would the algebraic expression change if we "add 1" instead of subtracting 1?
2. What would the expression look like if we divide the result by 3 instead of multiplying?
3. How do we expand the expression $3(x - 1)$?
4. What is the result if $x = 4$ in $3(x - 1)$?
5. How can this expression be graphed on a coordinate plane?

Tip:

Always follow the order of operations (parentheses, exponents, multiplication/division, and addition/subtraction) when interpreting or simplifying expressions.