The flight of a helium balloon can be approximated by the function, f (x) = -0.5x^2 + 20x + 30 where f(x) represents the height of the balloon in yards and x is the time in seconds. What is the maximum height of the balloon?

Acircular city park has a sidewalk directly through the middle that is 111 - feet long. if each bag of fertilizer covers 50 square feet, then determine how many bags of fertilizers the parks and recreation department needs to use to cover the circular park. ignore all the sidewalks around and through the park.

The variable in a relation who’s value depends on the value of the independent variable is called what?

What is the range? can’t seem to find it out