Amarathon runner will donate $5000 to charity if her time is less than or equal to 3 hours. she will donate $2000 if her time is more than 3 hours but less than or equal to 4 hours. finally, she will donate $1000 to charity if her time is more than 4 hours.
a. write a piecewise function describing this situation.

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

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?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)