& show ur work which expression is equivalent to (-15.5)divid sign (-0.5)(1.5) ? a (-31)(1.5) b (-7.75)(1.5) c (7.75)(1.5) d(31)(1.5)

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation