The number of apples produced by each tree in an apple orchard depends on how densely the trees are planted. if n trees are planted on an acre of land, then each tree produces 900-9n apples. so the number of apples produced per acre is a(n)=n(900-9n)

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.