There is concern that increased industrialization may be increasing the mineral content of river water. ten years ago, thesilicon content of the water in a certain river was 5 mg/ l. eighty-five water samples taken recently from the river havemean silicon content 5.6 mg/l and standard deviation 1.2 mg/ l. can you conclude that the silicon content of the water isgreater today than it was 10 years ago?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Graph the system of inequalities presented here on your own paper, then use your graph to answer the following questions: y < 4x − 8 y is greater than or equal to negative 5 over 2 times x plus 5 part a: describe the graph of the system, including shading and the types of lines graphed. provide a description of the solution area. (6 points) part b: is the point (5, −8) included in the solution area for the system? justify your answer mathematically. (4 points)

Graph the line with the given slope m and y-intercept b. m=-3,b=1