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
Rectangle and parallelogram
It will have two pairs of parallel sides.
Since the midpoint lies on the axis, both ends are therefore equidistant from the axis and are mirrors of each other so..
Q = (4,9)
The perimeter is the sum of all its sides.
That is for all triangles or polygons in general.
Good luck!
M.
