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• select the correct answer. which chemical equation represents a precipitation reaction? a. mgbr2 + 2hcl → mgcl2 + 2hbr b. k2co3 + pbcl2 → 2kcl + pbco3 c. 4lic2h3o2 + tibr4 → 4libr + ti(c2h3o2)4 d. 2nh4no3 + cucl2 → 2nh4cl + cu(no3)2
  
• a tunnel on a bike trail is being designed similar to the picture below. photograph shows the entrance of a semicircular road tunnel. the height of the new bike tunnel, y, in feet, is given by the following equation, where x is the horizontal distance, in feet, from the center line of the opening of the tunnel. note that negative x-values indicate the distance to the left of the center line, and positive x-values indicate the distance to the right of the center line. plot the points on the graph where the height of the tunnel is a maximum and where the height of the tunnel is zero feet.
  
• why were the first factories more efficient than the earlier putting-out system? a. they did not require an outside source of power. b. they allowed laborers to build a product from start to finish. c. they brought workers and machines together in one place. d. they could be built in any location.
  
• click this link to view o*net’s tasks section for police patrol officers. note that common tasks are listed toward the top, and less common tasks are listed toward the bottom. according to o*net, what are some common tasks performed by police patrol officers? check all that apply.
  
• this graph shows changes in gdp and the unemployment rate in the united states in recent years. a graph titled annual change in u s unemployment and g d p from 2005 to 2012 has year on the x-axis and percent of change on the y-axis, from negative 4 to 4 in increments of 2. between 2008 and 2009 the g d p decreased by about 3 percent. between 2008 and 2009, the unemployment rate increased about 1.5 percent. the unemployment rate was highest in 2009. in what year would someone looking for work have had the hardest time finding a job? 2008 2009 2011 2012
  
• which of the following adaptations will help a plant survive in a desert? stem that stores water shallow root system large surface area flat broad leaves
  
• explain how to write and evaluate an algebraic expression. thirteen less than the quotient of forty and a number; evaluate when n = 2.
  
• a detergent is created by mixing washing soda, borax, and water. the table below shows the composition of three different detergents. composition of detergents a b c washing soda 0.05 0.15 0.20 water 0.80 0.80 0.70 borax 0.15 0.05 0.10 travis needs to use a combination of the detergents to create 100 ounces of a detergent that is 15% washing soda, 75% water, and 10% borax. which is true?
  
• in what two ways did president franklin d. roosevelt play a role in the bonus army marches?
  
• how does detective noonan's comment about the murder weapon affect mary's actions?