Answer:
f(-6) = -9
Step-by-step explanation:
here, you substitute -6 for x in the function
f(x) = 3x + 9
f(-6) = 3(-6) + 9
f(-6) = -18 + 9
额哈哈哈哈哈哈啊啊啊看看我看情况
额哈哈哈哈哈哈哈叭叭叭那那那鸡尾酒
