Final answer:
The variable x in the equation 6(x + 18) = 192 represents the number of boards in one cabinet kit.
Step-by-step explanation:
The equation given is 6(x + 18) = 192. In this context, the variable x represents the number of boards in one kit. This is because each kit includes 18 screws, and since Jarred buys 6 of these kits, we are multiplying the total number of screws and boards in one kit (x + 18) by 6.
When you solve the equation for x, you would find the number of boards in one kit. The number of boards in all 6 kits would be 6 times x.