Plz help its due today

timurjin [86]

Convert each mixed number to an improper fraction

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Convert 6&1/2 to an improper fraction

6&1/2 = (6*2+1)/2
6&1/2 = (12+1)/2
6&1/2 = 13/2
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Do the same for 9&1/4

9&1/4 = (9*4+1)/4
9&1/4 = (36+1)/4
9&1/4 = 37/4
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Now multiply the improper fractions 13/2 and 37/4. Multiply straight across

(13/2)*(37/4) = (13*37)/(2*4)
(13/2)*(37/4) = 481/8
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The last step is to use long division to find the mixed number equivalent of 481/8

Or we an say
60*8 = 480
So 60*8+1 = 480+1
which means
481/8 = (480+1)/8 = 480/8+1/8 = 60&1/8

Making the final answer to be choice C

Another way to get the answer is to convert 481/8 into a decimal to get 60.125 and then convert that back to a mixed number. You should get 60&1/8

6 0

3 years ago

An educational psychologist wants to test whether a new teaching method negatively affects reading comprehension scores. She ran

yarga [219]

Answer:

$z=\frac{87.8-90.1}{\frac{17.3}{\sqrt{38}}}=-0.820$

The p value for this case would be given by:

$p_v =2*P(z$

Since the p value is very high ant any significance level we will have enough evidence to FAIL to reject the null hypothesis, so then we can conclude that the true mean is not significantly different from 90.1 and the method not shows a significantly effect in the scores.

Step-by-step explanation:

Information provided

$\bar X=87.8$ represent the sample mean for the scores on the standardized test in the general population of 6th graders

$\sigma=17.3$ represent the population standard deviation

$n=38$ sample size

$\mu_o =90.1$ represent the value that we want to verify

z would represent the statistic

$p_v$ represent the p value for the test

System of hypothesis

We want to verify if the new teaching method negatively affects reading comprehension scores, so then the system of hypothesis for this case are:

Null hypothesis: $\mu =90.1$

Alternative hypothesis: $\mu \neq 90.1$

Since we know the population deviation the statistic would be:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

Replacing the info given we got:

$z=\frac{87.8-90.1}{\frac{17.3}{\sqrt{38}}}=-0.820$

The p value for this case would be given by:

$p_v =2*P(z$

Since the p value is very high ant any significance level we will have enough evidence to FAIL to reject the null hypothesis, so then we can conclude that the true mean is not significantly different from 90.1 and the method not shows a significantly effect in the scores.

3 0

3 years ago

Read 2 more answers

How does a fraction model help you

goblinko [34]

Answer:

Fraction models can help clarify ideas that are often confused in a purely symbolic mode and construct mental terms that help them to perform fraction tasks meaningfully.

Step-by-step explanation:

3 0

3 years ago

Naomi is saving money and plans on making monthly contributions into an account earning a monthly interest rate of 0.35%. If Nao

Yakvenalex [24]

Answer:

brainliest please?

Step-by-step explanation:

6 0

3 years ago

Jed deposited $400 into a bank that offers 3.9% interest rate compounded daily and how many years will his balance be $800

Mekhanik [1.2K]

Answer:

18 years ( approx )

Step-by-step explanation:

Since, if an amount is compounded daily,

Then, the final amount after t years is,

A= P(1 + r/365) 365t

Where, P is the principal amount

r is the annual rate ( in decimals ),

t is the number of years,

Given,

A = $ 800,

r = 3.9% = 0.039,

P = $ 400,

By substituting the values,

800= 400 (1 + 0.039/365)365t

t = 17.774 = 18

Hence, his balance will be $800 after approximately 18 years.

3 0

4 years ago