Answer:
C). 0.39 grams
Step-by-step explanation:
First find how many half-lifes are in 3 hours:
3 hours ÷ 20 minutes = 9 half-lifes
Find the total left:
0.5^9*200 ≈ 0.39
Find the area of the rectangle. 39 times 16=
624-pi (radius squared)
624-3.14 times 8 squared
624- 200.96
423.04 cm ^2
Answer:
30 years
Step-by-step explanation:
41 minus 11=
X=Marks sister's age
x+11= Marks age
x+11 +8 = 2x+8
x+19=2x +8
x+19-x=2x-x +8
19-8=x+8-8
11=x Marks sisters age in 8 years
11-8= 3 Marks sisters age now
x+11=22 Marks age in 8 years
22-8= 14 Marks age now
You multiply the price by 1.06 to get the total cost with tax. That amount is $212
