I’m in a hurry PlSSS ANYONEEW ?????

Mathematics

1 answer:

SVEN [57.7K]3 years ago

5 0

I’m pretty sure it’s B

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A sample of radium has a weight of 1.5 mg and decays

Oliga [24]

Answer: $(b)$

Step-by-step explanation:

Given

Initial mass of radium is $A_o=1.5\ mg$

It decays by half every 6 years i.e. $T_{\frac{1}{2}}=6$

For radioactive decay, sample at any time is given by

$\Rightarrow A=A_o2^{-\dfrac{t}{T_{\frac{1}{2}}}}$

Insert the values

$\Rightarrow A=1.5\cdot 2^{\dfrac{-t}{6}}\\\\\Rightarrow A=1.5\cdot \left(\dfrac{1}{2}\right)^{\dfrac{-t}{6}}\\\\\Rightarrow A=1.5\cdot (0.5)^{\dfrac{t}{6}}$

Thus, option (b) is correct.

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3 years ago

- 4a = 36 find the value of a<br>

goblinko [34]

Answer:

-9 = a

Step-by-step explanation:

Divide both sides by -4 to isolate a: a = -36/4 = -9 = a

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4 years ago

The probability that Andrew has heart disease is 0.9. Andrew takes a test for the disease that has an accuracy rate of 75%. What

djverab [1.8K]

The probability that Andrew has heart disease is 0.9. Andrew takes a test for the disease that has an accuracy rate of 75%. What is the probability that Andrew has heart disease and the test accurately predicts it?

Answer: The probability that Andrew has heart disease $=0.9$