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MissTica
3 years ago
13

I need help with this question

Mathematics
1 answer:
aliya0001 [1]3 years ago
4 0

Question 2. 2470, 2474
Question 3. 2471, 2473, 2477
Challenge: 340 341 342 343 344
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Fed [463]
7*7=49+5=54 just use PEMDAS
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If x- 3/4 =2 1/9 what does the x equals?
Romashka-Z-Leto [24]
3/4+-2 1/9=your ****ing answer
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The radioactive isotope radium has a half-life of 1,600 years. The mass of a 100-gram sample of radium will be______ grams after
Olenka [21]
To solve this we are going to use the half life equation N(t)=N_{0} e^{( \frac{-0.693t}{t _{1/2} }) }
Where:
N_{0} is the initial sample
t is the time in years
t_{1/2} is the half life of the substance
N(t) is the remainder quantity after t years 

From the problem we know that:
N_{0} =100
t=200
t_{1/2} =1600

Lets replace those values in our equation to find N(t):
N(200) =100e^{( \frac{(-0.693)(200)}{1600}) }
N(200)=100e^{( \frac{-138.6}{1600} )}
N(200)=100e^{-0.086625}
N(200)=91.7

We can conclude that after 1600 years of radioactive decay, the mass of the 100-gram sample will be 91.7 grams.

8 0
3 years ago
POSSIBLE POINTS 10
Olin [163]
94.2 in would be your answer
5 0
3 years ago
Solve the problem below by finding a common denominator 1/3 - 1/5
sweet [91]

Answer:

2/15

Step-by-step explanation:

1/3-1/5

5/15-3/15

= 2/15

3 0
3 years ago
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