Question 299190
There are 2 adults who plant 'z' trees. So there are {{{2z}}} trees that have been planted by adults total. Because there are 8 students and they each plant a single tree, this means that there are {{{8*1=8}}} trees planted by students total. In total, the club has planted {{{2z+8}}} trees



Now since "the group planted at least 12 trees" (at least being the key word here), this means that they planted 12 or more trees. So the inequality is {{{2z+8>=12}}}. I'll leave it to you to solve it.