What number must you add to complete the square for x^2 + 4x = 15 ?

Which fraction below is equivalent to 10/12?

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?

Find the domain of the following expression: 1/(√x)-2