26 g of zinc combines with 12.8 g of sulfur. what is the empirical formula of zinc sulfide?
a. zn2s2
b. zns2
c. zns
d. zn2s

The graph above shows how the price of cell phones varies with the demand quantity. the equilibrium price for cell phones is where both supply and demand quantities equal $100, 5,000 5,000, $100

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?