Identify the double displacement reaction.

2NH3 + H2SO4 ⟶ (NH4)2SO4
2NaBr + Ca(OH)2 ⟶ CaBr2 + 2NaOH
2NO2 ⟶ 2O2 + N2
3Pb + 2h3PO4 ⟶ 3H2 + Pb3(PO4)2

If my mom gets $13.05 an hour, and she works from 3: 30 to 10: 45 in the morning, how much money does my mom make?

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect