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olchik [2.2K]
3 years ago
15

Hi my question is what is 72x13​

Mathematics
2 answers:
olasank [31]3 years ago
8 0

Answer:

936

7 2

×  1 3

2  

2 1 6

7 2 0

9 3 6

Brainleist?

wariber [46]3 years ago
4 0
936 is the answer :)))))))))))
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The length of a rectangular window is 5 feet more than its width, w. The area of the
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Answer:

The equation could be used to find the dimensions of the  window would be:  w^{2}  + 5w = 36

Step-by-step explanation:

as

  • The length of a rectangular window is 5 feet more than its width, w.

and

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So it means

l = w + 5

A = lw

36 = (w + 5)w

w^{2}  + 5w = 36

Therefore, the equation could be used to find the dimensions of the  window would be:  w^{2}  + 5w = 36

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Suppose that a class contains 15 boys and 30 girls, and that 10 students are to be selected at random for a special assignment.
natka813 [3]
Prob of selected students times prob of selecting boys times prob of selecting 3 boys
total students = 15b + 30g = 45 students

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2. 15b/45t = 0.33
3. 3b/15b = 0.2

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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
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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.

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3 years ago
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