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GREYUIT [131]
3 years ago
15

Alexander Litvinenko was poisoned with 10 micrograms of the radioactive substance Polonium-210. Since radioactive decay follows

a compounded continuously model, we can determine the amount of substance left in Alexander Litvinenko's body at any given time. If Polonium-210 has a decay rate of .502%, then determine the amount of Polonium-210 left in his body after 40 days. Provide 3 decimal places and units in your answer.
Mathematics
1 answer:
Artist 52 [7]3 years ago
7 0

Answer:.

Step-by-step explanation:

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Help please I need to find the area I don’t know how thanks
otez555 [7]

Answer:

49.62

Step-by-step explanation:

You can start by dividing the shape into 2 separate rectangles to make calculating the area easier.

9.3 x 2.4 = 22.32

10.5 x 2.6 = 27.3

Then, add the areas of the two separate rectangles to find the total area of the shape.

22.32 + 27.3 = 49.62. Hope that helped

4 0
3 years ago
((Use the graph shown below to fill in the blank.))
Naily [24]
When x is 4 the diagonal line is on the first line above the 4 so that would be y=1
7 0
3 years ago
Read 2 more answers
The cost of cementing 30 m² of floor area is $810. How much will it
Y_Kistochka [10]

Answer:

The answer is 1485 m^2

Step-by-step explanation:

27 per m^2 so 27 times 55 = 1485 m^2

6 0
3 years ago
Read 2 more answers
A plane flew 360km in 3 hrs when flying with the wind.With no change in the wind,the return trip took 4 hrs.Find the speed of th
morpeh [17]
Speed of the plane: 250 mph
Speed of the wind: 50 mph
Explanation:
Let p = the speed of the plane
and w = the speed of the wind
It takes the plane 3 hours to go 600 miles when against the headwind and 2 hours to go 600 miles with the headwind. So we set up a system of equations.
600
m
i
3
h
r
=
p
−
w
600
m
i
2
h
r
=
p
+
w
Solving for the left sides we get:
200mph = p - w
300mph = p + w
Now solve for one variable in either equation. I'll solve for x in the first equation:
200mph = p - w
Add w to both sides:
p = 200mph + w
Now we can substitute the x that we found in the first equation into the second equation so we can solve for w:
300mph = (200mph + w) + w
Combine like terms:
300mph = 200mph + 2w
Subtract 200mph on both sides:
100mph = 2w
Divide by 2:
50mph = w
So the speed of the wind is 50mph.
Now plug the value we just found back in to either equation to find the speed of the plane, I'll plug it into the first equation:
200mph = p - 50mph
Add 50mph on both sides:
250mph = p
So the speed of the plane in still air is 250mph.
6 0
2 years ago
Estimate the perimeter of the figure to the nearest whole number. PLZ SOLVE PLZ
soldier1979 [14.2K]

Answer:

The perimeter is approximately 19.

Step-by-step explanation:

Three of the sides are roughly four segments long and two are around three and a half.

4 + 4 + 4 + 3.5 + 3.5 = 19

7 0
3 years ago
Read 2 more answers
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