379,582 views
27 votes
27 votes
URGENT HELP ASAP, PLEASE HELP WITH MY GRADE 11 MATH!

URGENT HELP ASAP, PLEASE HELP WITH MY GRADE 11 MATH!-example-1
User Yuvaraj G
by
2.1k points

1 Answer

12 votes
12 votes

Half-Life Formula:

Amount remaining = (Initial amount)[ (1/2)^(time / half-life) ]

Amount remaining = ?

Initial amount = 200 mg

Time = 2 hours = 120 minutes

Half-Life = 20 mins

---Notice that I changed the time from hours to minutes. The time and half-life time need to be in the same unit.

A = (200)[ (1/2)^(120/20) ]

A = (200)(1/2 ^6)

A = (200)(1/64)

A = 3.125

Answer: 3.125 mg remain

Hope this helps!

User Marco Antonio
by
2.4k points