P=D•W what does this mean in a formula

Evaluate the following expression 1/3^2

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?