1. **State the problem:** We need to find the value of $C$ given the formula $C = 5a + 4d$ when $a = -3$ and $d = 6$.
2. **Formula used:** The formula is $C = 5a + 4d$.
3. **Substitute the values:** Replace $a$ with $-3$ and $d$ with $6$:
$$C = 5(-3) + 4(6)$$
4. **Calculate each term:**
$$5(-3) = -15$$
$$4(6) = 24$$
5. **Add the results:**
$$C = -15 + 24 = 9$$
6. **Final answer:**
$$\boxed{9}$$
So, the value of $C$ is 9.
Value Of C
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