Pls, pls, pls, answer this What has happened to the atoms of the reactants?

Lead Nitrate + Sodium Iodide ==>Sodium Nitrate + Lead Iodide

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score