1 answer:
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Answer:
1) 62.5
2) 50
3) 75
4) 100
Step-by-step explanation:
1)
Because it has a half-life of 25 days, half of it will decay after 25 days.
After days, there will be
of it left.
So, .
2)
Because it has a half-life of 25 days, half of it will decay after 25 days.
After days, there will be
of it left.
So,
3)
Because it has a half-life of 25 days, half of it will decay after 25 days.
After days, there will be
of it left.
So, .
4)
The only answer left is grams. You can solve it the same way you solved the previous steps.
Given:
The vertices of a parallelogram are P(1,2,1), Q(1,0,-1), R(2,2,0).
PQ and PR are the adjacent sides of the parallelogram.
To find:
The coordinates of vertex S.
Solution:
We know that, the diagonals of a parallelogram bisect each other.
Let the coordinates of the vertex S are (a,b,c).
In the given parallelogram PS and QR are the diagonals. It means their midpoints are same.
On comparing both sides, we get
Similarly,
And,
Hence, the coordinates of vertex S are (2,0,-2).