Answer:
4.8 hours
Step-by-step explanation:
The formula for half life is given as:
t½ = t × In(2)/In(No/Nt)
Where
t½ = Half life
t = time in hours = 4
No = Initial amount = 10mg
Nt = Final amount after 3 hours = 6.5 mg
t½ = 3 × In(2) /In(10/6.5)
t½ = 4.8271216522281 hours
Approximately = 4.8 hours
Answer:5 1/5
Step-by-step explanation:
12 1/5 =12.2 as a decimal
12.2 x 1.5 = 18.3
15 2/3 x 1.5 = 23.5
23.5 -18.3 =5 1/5
If he has 12 nails left, he used 36 nails.