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salantis [7]
2 years ago
7

HELP HELP HELP HELP

Mathematics
1 answer:
Law Incorporation [45]2 years ago
8 0
But it’s not like that you’re too old and like I don’t want to get them off of it and I don’t think it’s ok with me and I want you and I want to go to the school because
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Suppose a laboratory has a 30 g sample of polonium-210. The half-life of polonium-210 is about 138 days. How many half-lives of
Gwar [14]
That is exactly 8 half lives.
After 8 half - lives only (1 / 2^8) or (1 / 256) of the original 30 grams will remain.
(1 / 256) = <span> <span> <span> 0.003906250 </span> </span> </span>
So, 30 * <span> <span> 0.003906250 = </span></span> <span> <span> <span> 0.1171875 grams will remain.
 </span></span></span>




4 0
3 years ago
Read 2 more answers
If light travels at 10,000 km in 3.0 x 10² seconds,
eduard

Answer:

1000xm

Step-by-step explanation:

1 meter = 3.2808 feet, hence. 9.8424 x 10^8 feet in 1 second. 1 foot in x seconds. hence it takes 1 / (9.8424 x 10^8) = 0.10168 x 10^(-8) seconds. ➡️1km = 1000xm⬅️

4 0
1 year ago
Julie, a police officer, has the following work pattern. She works 3 days, has 4 days off, then works 4 days, then has 3 days of
zalisa [80]

Answer:

See below.

Step-by-step explanation:

For each day number, Y means working, and N means off

Day

1   Y

2   Y

3   Y

4   N

5   N

6   N

7   N

8   Y

9   Y

10   Y

11   Y

12   N

13   N

14   N

15   Y

16   Y

17   Y

18   N

19   N

20   N

21   N

22   Y

23   Y

24   Y

25   Y

26   N

27   N

28   N

29   Y

30   Y

31   Y

32   N

33   N

34   N

35   N

36   Y

37   Y

38   Y

39   Y

40   N

41   N

42   N

43   Y

44   Y

45   Y

46   N

a. Today is day 1. 30 days from today is day 31.

She works on day 31, so she does work 30 days from today.

b. 45 days from today is day 46. She is off on day 46, so she will be off 45 days from today.

8 0
3 years ago
Read 2 more answers
Can anyone help with this?? I need this grade but I just don't get it. Joshua has a ladder that is 12.8 ft long. He wants to lea
Darina [25.2K]

Answer:

Yes the ladder is safe because 59.25 degrees < 75 degrees

Step-by-step explanation:

In the below photos I have included a screenshot of the equation I used, which I got from another user, and my work with an unfinished diagram and completed equations to the side

5 0
3 years ago
In the expression 2a-5+4a-9, name the constants​
Vika [28.1K]

Answer:

-5 and -9 are the constants, can also be written -14

4 0
2 years ago
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