To find the cost of each tool kit, let's analyze the situation.
The initial group package cost is $308, and after upgrading to include the fossil tool kits for 22 students, the total cost is $440. The additional cost for the tool kits can be calculated by subtracting the initial package cost from the total cost after the upgrade.
So, we have: Total cost after upgrade: $440 Initial package cost: $308
The cost for the tool kits alone would be: 440 - 308 = $132
Since there are 22 students and the cost of each tool kit is represented by \( k \), we can set up the equation: \[ 22k = 132 \]
Another way to express it to solve for \( k \) would be: \[ 22k + 308 = 440 \]
Thus, among the given options, the correct equation to use is: 22k + 308 = 440