The percentage of the original sample that is left after 115 days is; 23.4733%
<h3>How to calculate the decay percentage?</h3>
Formula for radioactive decay is;
A = A₀ * (1/2)^(t/t_¹/₂)
where;
A = quantity of the substance remaining
A₀ = initial quantity of the substance
t = time elapsed
t_¹/₂ = half life of the substance
Thus;
A/A₀ = (1/2)^(115/55)
A/A₀ = 0.234733 or 23.4733%
Read more about decay constant at; brainly.com/question/11117468
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Answer:
1 Solution
Step-by-step explanation:
0=4/3x
multiply by 3
0=4x
Divide by 4
X = 0
Answer:
x = cos(θ)
Step-by-step explanation:
The above relation is one that is usefully committed to memory. The mnemonic SOH CAH TOA can help you remember it, along with ...
y = sin(θ)
The x-value is adjacent to the central angle; the y-value is opposite. The hypotenuse of the relevant triangle in a unit circle is 1.
The x-value is ...
x = cos(θ)
_____
These relationships are necessary to convert from rectangular to polar coordinates and vice versa. They are also helpful when working vector problems.
Answer:
78 ????? I can't find a logic or math error take the answer for what is worth
Step-by-step explanation:
Check my work for yourself and post your answer.
Extend the long diagonal to the point (6,4) to create a large triangle that has a base of 14 and a height 12 so this super triangle area is
area = 1/2 bh
= 1/2 (14)(12)
= 7(12)
= 84 sq units
Now subtract off two smaller triangles that were created when the diagonal was extended to the (6, 4) point
area1 = 1/2 bh
= 1/2 (4)(2)
= 4 sq units
area2 = 1/2 bh
= 1/2 (2)(2)
= 2 sq units
Total area = area - area1 - area2
= 84 - 4 - 2
= 78 sq units
8 b³ / 20 b³
May be easier to handle if you write it like this:
( 8 / 20 ) x ( b³ / b³ )
In the first fraction, divide top and bottom by 4, and it becomes ( 2 / 5 ).
In the second fraction, divide top and bottom by b³, and it becomes ( 1 / 1 ).
Now the problem is ( 2 / 5 ) x ( 1 / 1 ). This is <em>2/5</em> .
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Easier way:
8 b³ / 20 b³
Divide the top by 4b³ and it becomes 2 .
Divide the bottom by 4b³ and it becomes 5 .
Now the fraction is <em>2/5</em> .
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The important thing to understand:
(8 of anything) / (20 of the same thing) = <em>2/5</em>
It doesn't matter if the things are cows, stones, leaves, or 'b³'s.