4 years ago

Why does math even exist?

Mathematics

2 answers:

TEA [102]4 years ago

5 0

It does but why do we know the letter x all in favor of getting rid of math say I

natita [175]4 years ago

4 0

I know I dislike it as well! Sorry you are having trouble with it! :)

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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

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kirza4 [7]

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I explanation

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Vikentia [17]

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3 years ago

A cable company charges $50 for installation and $80 per month for service. Choose the equation that shows the total cost, c, in

Serhud [2]

The answer would be c

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3 years ago

Read 2 more answers

Monique said 0.70 is greater than 0.7 because 70 is greater than 7. do you agree with monique

elixir [45]

No. 0.70 is the same as 0.7, for the place value of 7 is the same for both (tenths place). In 0.70, the place value of 0 is the hundredth, which is not needed.

0.70 = 0.7

Disagree is your answer

hope this helps

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3 years ago