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P= price tax is 4% added to the price. which expression shows the total price including tax?

Which statement is true about the function f(x)= square root -x ? the domain of the graph is all real numbers. the range of the graph is all real numbers. the domain of the graph is all real numbers less than or equal to 0. the range of the graph is all real numbers less than or equal to 0.

What is the following product? sqrt 30 • sqrt 10