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3 years ago

The marked price of a watch is Rs. 4,000. A shopkeeper sold it at

Mathematics

1 answer:

Umnica [9.8K]3 years ago

5 0

Step-by-step explanation:first of all we have to find discount amount by using the formula discount% of M.P then finding S.P using the formula M. P -S. P then finding the profit using the formula profit% of S. P and at last we have to find C. P using the formula S. P - profit.

I hope u will understand .

hawa xa explanation tei pani herea bujxa hola .

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Wich expression is equivalent to 21 - (-5) ??

Nadusha1986 [10]

Answer:

21 + 5 is the the same thing.

Step-by-step explanation:

4 0

3 years ago

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Which are the solutions of the quadratic equation? x2 = 9x + 6

r-ruslan [8.4K]

we have

$x^{2}=9x+ 6$

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$x^{2}-9x=6$

Complete the square. Remember to balance the equation by adding the same constants to each side

$x^{2}-9x+4.5^{2}=6+4.5^{2}$

$x^{2}-9x+20.25=6+20.25$

$x^{2}-9x+20.25=26.25$

Rewrite as perfect squares

$(x-4.5)^{2}=26.25$

$(x-4.5)=(+/-)\sqrt{26.25}\\ \\x1=4.5+\sqrt{26.25}=9.623\\x2=4.5-\sqrt{26.25}=-0.623$

therefore

the answer is

$x1=4.5+\sqrt{26.25}=9.623$

$x2=4.5-\sqrt{26.25}=-0.623$

7 0

3 years ago

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Both the P-value method and the critical value method use the same standard deviation based on the claimed proportion p, so they

erastova [34]

Answer:

Yes, it's also true about the confidence interval method.

Step-by-step explanation:

The confidence interval includes all the null hypothesis values for the population mean that would be accepted by the hypothesis test at the significance level of 5%. Now, it means this assumes a two-sided alternative.

Now, when testing claims about

population proportions, the critical method and the P-value method are equivalent due to the fact that they always produce the same result. Similarly, a conclusion based on a confidence interval estimate will be the same as a conclusion based on a hypothesis test.

So, Yes the confidence interval method and the P-value or critical methods will always lead to the same conclusion when the tested parameter is the standard deviation.

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3 years ago

according to the Food and Drug Administration, the recommended daily intake of iron is 18 mg. This is 4 less than twice the reco

Law Incorporation [45]

The intake of zinc would be 11

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3 years ago

A=(2 3) (-1 4) Calculate A^2-6A+11I

disa [49]

Answer:

A² - 6A + 11 I = $\left[\begin{array}{ccc}0&0\\0&0\end{array}\right]$

Step-by-step explanation:

Given the matrix

$A=\left[\begin{array}{ccc}2&3\\-1&4\end{array}\right]$

Calculate A² - 6A + 11 I

$A^2 = A*A= \left[\begin{array}{ccc}2&3\\-1&4\end{array}\right] *\left[\begin{array}{ccc}2&3\\-1&4\end{array}\right] = \left[\begin{array}{ccc}2*2-3*1&2*3+3*4\\-1*2-4*1&-1*3+4*4\end{array}\right] =\left[\begin{array}{ccc}1&18\\-6&13\end{array}\right]$

$6A=6*\left[\begin{array}{ccc}2&3\\-1&4\end{array}\right] =\left[\begin{array}{ccc}12&18\\-6&24\end{array}\right]$

$11 I = 11 * \left[\begin{array}{ccc}1&0\\0&1\end{array}\right] =\left[\begin{array}{ccc}11&0\\0&11\end{array}\right]$

∴ A² - 6A + 11 I = $\left[\begin{array}{ccc}1&18\\-6&13\end{array}\right] -\left[\begin{array}{ccc}12&18\\-6&24\end{array}\right] +\left[\begin{array}{ccc}11&0\\0&11\end{array}\right] =\left[\begin{array}{ccc}0&0\\0&0\end{array}\right]$

8 0

3 years ago