57,909,000 in scientific notation

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

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 the scale factor between two circles is 2x/5y what is the ratio of their areas?