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Vedmedyk [2.9K]
3 years ago
8

A sample contains 400 Plutonium-244 atoms. After 1 half-life(s) how many plutonium atoms are left on average?

Mathematics
1 answer:
SpyIntel [72]3 years ago
8 0

Answer:

200

Step-by-step explanation:

Divide 400 by 1/2 or 2.

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3. Determine a lower bound for the radius of convergence of series solutions about each given point ro for the given different i
AlladinOne [14]

Answer:

Step-by-step explanation:

37

5 0
3 years ago
What's the difference between 1261⁄4 and 78 2⁄3?
BARSIC [14]
126 1/4 = 126 3/12 = 125 15/12 

- 78 2/3 = - 78 8/12 = - 78 8/12 
--------------------------------------... 
47 7/12 

1) Find the lowest common denominator (LCD) for the fractions. In this case, 12 is the LCD. 

2) Rewrite the fractions 1/4 and 2/3 using 12 as the denominator (second column). You get 3/12 and 8/12. 

3) Since it's confusing to subtract 8/12 from 3/12, you need to borrow one from the 126. Doing so is the same as taking 12/12 from 126. This changes to 125, and the 12/12 adds to the 3/12 making it 15/12. 

4) Subtract 8/12 from 15/12 to get 7/12. 

5) Subtract 78 from 125 to get 47. 

6) The answer is 47 7/12.
8 0
3 years ago
Read 2 more answers
Which angles are vertical angles in the figure shown? Select two answers.
sukhopar [10]

Answer:

B and C

Step-by-step explanation:

Vertical angles are formed when you make lines make an  x shape (or a turned x shape).  The vertical angles are, on a normally positioned x the top and bottom angle, as well as the left and right angle.  so every x has 2 vertcial angles unless the x is further split up.

So the part with angles 1. 2. 3 and 4 the top angle is 2, the bottom is 3, the left angle is 1 and the right angle is 4.  This means the vertical angle pairs are 1 and 4 as well as 2 and 3.

So in total there are 2 x shapes, so 4 pairs of vertical angles.  Here are all the vertical angles.

1 and 4

2 and 3

5 and 8

6 and 7

So from your choices you have 2 and 3 as choice B and 5 and 8 as choice C.

8 0
3 years ago
What is 2/5 as a decimal?
lara31 [8.8K]
2/5 in decimal form would be 0.4
7 0
3 years ago
Read 2 more answers
Khan Academy 8th grade
Zina [86]

Answer:

  • d=101

Step-by-step explanation:

\sf d=-20+11t \sf when \sf t=11

\sf d=-20+11(11)

\sf d=-20+121

\sf d=101

Hope it helps!

8 0
2 years ago
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