1. The problem is to evaluate the expression $30 \times 3 \times t$ where $t$ is a variable. 2. The formula used here is the multiplication of constants and a variable: $a \times b \times t = (a \times b) \times t$. 3. Multiply the constants first: $30 \times 3 = 90$. 4. Now multiply the result by $t$: $90 \times t = 90t$. 5. So, the simplified expression is $90t$. This means the product of 30, 3, and $t$ is $90t$.