Help I have a problem! I got an answer but it wasn't right

What is the standard form of -5x^2+2x^4-11+x^3+3x

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?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.