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3 years ago

If you plot the absorbance measurements of solutions vs. their concentrations, what is the slope equal to:_______

Mathematics

1 answer:

Sauron [17]3 years ago

5 0

Answer:

Molar absorptivity coefficient

Step-by-step explanation:

Normally, from beer's law and molar extinction coefficients, the absorbance of a solution will vary with respect to the concentration or the change in the size of the container. Now, Molar absorptivity takes care of this change/variation by dividing by both the concentration and the length or measurement of the solution that the light passes through.

Since the molar absorptivity divides both the absorbance measurements and the corresponding concentrations, we can say it is the slope of the graph because the slope will be equal to the division of corresponding values of both parameters of absorbance and concentrations.

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Help me pleasee i really need help

Usimov [2.4K]

For ALL of these....use these formulas...

Finding Markup%

Markup=Selling Price-Cost

Markup%= $\frac{Markup}{Cost}*100$

1.) Recliner Chair. Cost=$61 Sell Price=$75.99

Markup= $75.99-$61
M=$14.99

Markup%= $\frac{14.99}{61} *100$

Markup%=24.5% (Markup less than 25%)

2.) Basket Ball. Cost=$23.75 Selling Price=$29.95

Markup= $29.95-$23.75
M=$6.20

Markup%= $\frac{6.20}{23.75} *100$

Markup%=26.1 (Markup greater than 25%)

3.) Necklace. Cost=$15 Selling Price=$19.25

Markup= $19.25-$15
M=$4.25

Markup%= $\frac{4.25}{15}*100$

Markup%=28.3 (Markup greater than 25%)

4.)Notepad. Cost=$1.19 Selling Price=$1.50

Markup=$1.50-$1.19
M=$0.31

Markup%= $\frac{0.31}{1.19}*100$

Markup%=26.1 (Markup greater than 25%)

5.)Speakers. Cost=$44.55 Selling Price=$54.99

Markup=$54.99-$44.55
M=$10.44

Markup%= $\frac{10.44}{44.55} *100$

Markup%=23.4 (Markup less than 25%)

6.) DVD. Cost=$10.80 Selling Price=$12.95

Markup=$12.95-$10.80
M=$2.15

Markup%= $\frac{2.15}{10.80}*100$

Markup%=19.9 (Markup less than 25%)

I hope this benefits other people in the future. :D

5 0

3 years ago

A. y = z - xz + w<br> B. y = wz - x<br> C. y = wz - xz<br> D. y = x(w - z)

Alexeev081 [22]

Answer:

y=zw-zx in other words c

Step-by-step explanation:

w= zx+y/z

zw=zx+y

y=zw-zx

7 0

3 years ago

Read 2 more answers

two complementary angles have a difference of 36°. Find the measure of each angle. (Complementary angles are angles that add up

ElenaW [278]

Answer:

27°,63°

Step-by-step explanation:

Let the two angles be a and b.

They are complementary, meaning they add up to 90. Thus:

$a+b=90$

And we are told their difference is 36. Therefore:

$a-b=36$

Solve for the system of equations. Add b to both sides in the second equation:

$a=b+36$

Substitute this into the first:

$(b+36)+b=90$

Combine like terms;

$2b+36=90$

Subtract 36:

$2b=54$

Divide by 2:

$b=27$

So, b is 27 degrees.

Use the second equation again:

$a-b=36$

Now that we know b is 27, substitute:

$a-27=36$

Add 27 to both sides:

$a=63$

So, a is 63 degrees.

And we're done :)

4 0

3 years ago

Read 2 more answers

A national interest rate on houses for 25 years is 4.3%. A banker in a large northwestern city believes that the local interest

stepladder [879]

The national interest rate on houses for 25 years is 4.3%. The banker wishes to test that the local interest rates are lower than the national rate. So he should use the initial data of 4.3% interest as his base data. Then he should investigate the rates of houses in the local vicinities and compare it to his base data.

7 0

4 years ago

A new anxiety medication has been manufactured and a study is being conducted to determine whether its effectiveness depends on

Irina18 [472]

The test statistics is used to determine if the anxiety medication can happen under a null hypothesis

The test statistics that is an appropriate hypothesis test is $z =\frac{0.35 - 0.40}{\sqrt{\frac{0.35(1 - 0.35)}{60} + \frac{0.40(1 - 0.40)}{85}}}$

<h3>How to determine the test statistic</h3>

<u>40 milligrams of medication</u>

Patients = 60

Lower stress level patients = 21

The mean of this medication is:

$\bar x = \frac{x}{n}$

So, we have:

$\bar x_1 = \frac{21}{60}$

$\bar x_1 = 0.35$

<u>75 milligrams of medication</u>

Patients = 85

Lower stress level patients = 34

The mean of this medication is:

$\bar x = \frac{x}{n}$

So, we have:

$\bar x_2 = \frac{34}{85}$

$\bar x_2 =0.4$

The test statistic is then calculated as:

$z =\frac{\bar x_1 - \bar x_2}{\sqrt{\frac{\bar x_1(1 - \bar x_1)}{n_1} + \frac{\bar x_2(1 - \bar x_2)}{n_2}}}$

The equation becomes

$z =\frac{0.35 - 0.40}{\sqrt{\frac{0.35(1 - 0.35)}{60} + \frac{0.40(1 - 0.40)}{85}}}$

Hence, the test statistics that is an appropriate hypothesis test is $z =\frac{0.35 - 0.40}{\sqrt{\frac{0.35(1 - 0.35)}{60} + \frac{0.40(1 - 0.40)}{85}}}$