You are a coaster when a shoe falls off your foodThe function y = 76 - 16t ^ 2 represents the height y feet) of the shoe after it falls off your foot lands on the top of a 12-buildingAfter many seconds the shoe ?

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The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year. how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Ammonia molecules have three hydrogen atoms and one nitrogen atom. how many of each atom arein five molecules of ammonia