the desity of ethanol is 1.09g/cm^3 the desity of propylene is 0.97g/cm^3 80 liters of ethanol are mixed with 148 liters of propylene to make 228 liters of antifreeze work out the density of the antifreeze in g/cm^3

elli's hot cocao is more chocolaty

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source:  

1/8 is left? add a bit more info plz

the distance between the school and her home is 3.6km.

12 mins = 0.2 hours = 1/5 hour

54 ÷ 3 = 18km per hour

1/5 of 18 = 3.6km per 12 mins