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3 years ago

The cost price of 16 notebooks is equal to the selling price of 12 notebooks.Find the gain per cent.

Mathematics

1 answer:

madam [21]3 years ago

5 0

Answer:

Step-by-step explanation:

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3 years ago

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NEED HELP ASAP! Which number is between -0.49 and 0.01 on a number line?

dsp73

Answer:

-0.48 -0.47-0.46-0.45 -0.44 -0.43 -0.42 -0.41 -0.40 all the way to -0.01 or 0

Step-by-step explanation:

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3 years ago

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Vilka [71]

Answer:

1/6

Step-by-step explanation:

I don't know how to use it using a number line sorry

-1/3 - (-1/2)

Two minuses give us a plus

so:

-1/3 + 1/2

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so:

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3 years ago

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2 years ago

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The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain after 1000 years?

adell [148]

Answer: 129.33 g

Step-by-step explanation:

$$$Let $p=A \cdot e^{n t}$ \\$(p=$ present amount, $A=$ initial amount, $n=$ decay rate, $t=$ time)$

$\begin{aligned}&\Rightarrow \text { Given } p=\frac{A}{2} \ a t \ t=1590 \\&\Rightarrow \frac{1}{2}=e^{1590n} \Rightarrow n=\frac{\ln (1 / 2)}{1590}=-0.00043594162\end{aligned}$

$If $A=200 \mathrm{mg}$ and $t=1000$ then,$$\begin{aligned}P &=200 e^{\left(\frac{\ln \left(1/2\right)}{1590}\right) \cdot 1000} \text \\\\&=129.33 \text { grams}\end{aligned}$

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2 years ago