You are given the formula $d = (r - c)t$ and need to solve for $c$ using the values:

• $d = 12$
• $r = 5$
• $t = 4$

To isolate $c$, let's rearrange the formula:

$d = (r - c)t$

First, divide both sides by $t$ to simplify:

$\frac{d}{t} = r - c$

Next, isolate $c$ by subtracting $r$ from both sides:

$c = r - \frac{d}{t}$

Now, substitute the known values:

$c = 5 - \frac{12}{4}$

Simplifying:

$c = 5 - 3 = 2$

Thus, $c = 2$.

Would you like a more detailed explanation or have any questions?

Here are 5 related questions to consider:

1. How would you solve for $t$ in the same equation?
2. What happens if $t = 0$ in this formula?
3. Can you express $r$ in terms of $d$, $c$, and $t$?
4. How would the result change if $d$ were negative?
5. What does the variable $c$ represent in practical terms in this formula?

Tip: When solving for a variable, isolate it by performing inverse operations step by step.