Let a Cookie be represented by C
Let a Muffin be represented by M
Let a Scone be represented by S and,
Let the number of items be represented by n.
A dozen is 12 pieces,
The equation representing the total baked goods is,
[tex]\begin{gathered} \text{Total baked goods = C + M + S} \\ \text{Where, } \\ C=12\text{ dozen = 12}\times12=144 \\ M=18\text{ dozen = 18}\times12=216 \\ S=22\text{ dozen = 22}\times12=264 \end{gathered}[/tex]The total baked goods everyday will be,
[tex]\text{Total baked goods = C + M + S =144 + 216 + 264 = }624\text{ baked goods}[/tex]Hence, total goods baked everyday is 264.