Pls help I literally don’t get this

The sum of two numbers is 12 and their difference is 18 what are the two numbers

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?