When i add a quadratic function to a quadratic function, the new function is a

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

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