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Vinil7 [7]
2 years ago
12

Element X is a radioactive isotope such that every 26 years, its mass decreases by half. Given that the initial mass of a sample

of Element X is 390 grams, how long would it be until the mass of the sample reached 260 grams, to the nearest tenth of a year?​
Mathematics
1 answer:
SSSSS [86.1K]2 years ago
8 0

Answer:

It will take 15.029 years for element X to reach mass of 260 grams

Step-by-step explanation:

The half life period of radioactive element X is 26 years

The initial mass of radioactive element X is 260 grams

Elapsed time = half life * log (beginning amount /ending amount)/log 2

Substituting the given values, we get

Elapsed time = 26 * log (390/260)/log 2

=  15.209 years

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5/9 ÷ 2/3<br> PLEASE HELP I AM ACTUALLY NOT SMART
SSSSS [86.1K]

Answer:

5/6

Step-by-step explanation:

=5/9 * 3/2

simplify

5/3 * 1/2

=

5/6

8 0
3 years ago
The rule for the function g says to use x−2 as the input of function f.
Natali [406]

Subtracting a value from the input x shifts the graph that number of units to the right.

The answer would be C.

3 0
3 years ago
If John Ran 1/8 of a mile long he ran around the track 24 times how many miles is that
prohojiy [21]
3 miles, 1/8 time 24.
7 0
3 years ago
Read 2 more answers
What is the answer to 10x+8 ?
Sergeeva-Olga [200]
10x8? 80. 10, 20, 30, 40, 50, 60, 70, 80
8 0
4 years ago
Read 2 more answers
If you can answer this right i'll mark you brainiest
sweet-ann [11.9K]

Answer:Think of the equation as an equation for a line

y=mx+b

where in this case

C= 5 /9  (F−32)

or

C= 5 /9 F - 5/9 x 32

You can see the slope of the graph is  5 /9

, which means that for an increase of 1 degree Fahrenheit, the increase is  

5 /9  of 1 degree Celsius.

C= 5 /9 (F)

C= 5/9(1)

C=5/9

Therefore, statement I is true. This is the equivalent to saying that an increase of 1 degree Celsius is equal to an increase of  

9/5 degrees Fahrenheit.

C= 5/ 9 (F)

1= 5 /9 (F)

(F)= 9 /5

Since  

9/5 = 1.8, statement II is true.

The only answer that has both statement I and statement II as true is D, but if you have time and want to be absolutely thorough, you can also check to see if statement III (an increase of 5/9 degree Fahrenheit is equal to a temperature increase of 1 degree Celsius) is true:

C= 5 /9 (F)

C= 5 /9 x 5/9

C=25/81

(which is≠1)

An increase of  5/9

degree Fahrenheit leads to an increase of  

25/81.

, not 1 degree, Celsius, and so Statement III is not true.

The final answer is D.

5 0
2 years ago
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