What expressions from the table are equivalent to that expression ?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

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?

Abcd is a square. what is the measure of angle bac