The (w/w) % of aqueous solution of NaCl is 10. What is its (w/v) % ? (Density of solution is 2 g/mL)
(a) 20 (b) 50 (c) 30 (d) 80

The graph below could be the graph of which exponential function?

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The border line of the linear inequality 4x + 7y < 5 is dotted true or false?