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!
Answer:
81
Step-by-step explanation:
12(6) + 9
72 + 9
81......
Answer:
Explanation: As you make the segments smaller and smaller, the parallelogram becomes more of a rectangle with shorter side equal to the radius of the circle r and longer side πr - half of the circumference of the circle. Hence we get the formula πr2 for the area of a circle of radius r .
Step-by-step explanation:
Put 10% into a fraction 10/100 = 1/10. Now times 88 KG by 1/10 and you should have the answer.
10% = 10/100 = 1/10
88/1 X 1/10 = 1/20
Answer:
The lemonade costs 1.4.
Step-by-step explanation:
This question is solved using a system of equations.
I am going to say that:
x is the cost of a cookie.
y is the cost of a lemonade.
Total cost for cookie and lemonade is 1.80.
This means that 
.
As we want y, we have that 
Lemonade costs 1.00 more than the cookie?
This means that:
So
The lemonade costs 1.4.
