4 years ago

Pls help me on this real quick!!!

Mathematics

2 answers:

Scrat [10]4 years ago

6 0

It’s the second one

nikklg [1K]4 years ago

5 0

Answer:

Triangle on the left or the first one

Step-by-step explanation:

For triangle T there is another angle which is 180-110-40= 30 degrees. Then triangle on the furtherest left is the exact same

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What percent of a present amount of radioactive radium (226Ra) will remain after 1200 years? The half life of 226Ra is 1599 year

sp2606 [1]

Answer:

59.44%

Step-by-step explanation:

$M_{R} = \frac{M_{O} }{2^{n} }$

$n=\frac{t}{t\frac{1}{2} }$

Where $M_{R}$ = mass remaining

$M_{O}$ =original mass.

t= time

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$t\frac{1}{2}$ =1599, t= 1200, $M_{O}$ =226, $M_{R}$ =?

$n=\frac{1200}{1599}$

n= 0.750469

$M_{R} = \frac{226}{2^{ 0.750469} }$

$M_{R}$ =134.3367amu

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= 59.44%

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3 years ago

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sp2606 [1]

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I'm not 100% on this but I believe it is 68° as well

I hope this is good enough:

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