the human ear can only detect sounds between the frequencies 20 hertz and 20,000 hertz. write and graph and compound inequality that describes the frequency of sounds humans CANNOT hear.

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.

How to solve a simultaneous equation involved with fractions?

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?