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Zanzabum
3 years ago
10

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.

6 0
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

4 0
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

Also we know that the accuracy rate of test =75\% or 0.75

The given two events are independent.

Therefore, the probability that Andrew has heart disease and the test accurately predicts it =0.9 \times 0.75 =0.675



4 0
3 years ago
I need help with this I don't understand it best answer gets brainly ​
Eduardwww [97]

Answer:

2.638, 3.16, 3\frac{7}{11}, \frac{73}{20}

Step-by-step explanation:

Convert all the numbers as a decimal, this will make it easier to determine which value is greater or not.

Have a great day :)

4 0
3 years ago
Read 2 more answers
((sinB)/1+cosB) + ((1+cosB)/sinB) = 2cscB prove that the equation is an identity
Contact [7]

Step-by-step explanation:

If you need any explanation, we can communicate normally

4 0
3 years ago
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