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3 years ago

Simplify 3^2 • 3^5. PLZ HELP FAST WILL GIVE BRAINLIEST

Mathematics

2 answers:

Helen [10]3 years ago

8 0

Answer is 3^7

Explanation: have a good day/night :)

zheka24 [161]3 years ago

7 0

Answer:

1 2/13

Step-by-step explanation:

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Whats the answer to 1/4 times 4/7

timama [110]

So you are multiplying the fractions together. You do not need a common denominator. You multiply the numerators together and the denominators to get your new fraction.
1x4=4
4x7=28
4/28
This fraction can now be simplified by dividing the numerator and denominator by 4
4/28x4/4
1/7

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4 years ago

Which expression is equivalent 2(5)^4

DiKsa [7]

1,250 because you have to multiply 5 by 5 four times which is 625 and 625 multiplied by 2 is 1250.

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3 years ago

11/5 - 7/4 + 2/1 evaluate

irga5000 [103]

Step-by-step explanation:

11/5−7/4+2/1

=49/20(Decimal: 2.45)

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3 years ago

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zloy xaker [14]

Answer:

Step-by-step explanation:

Martin Luther King Jr. said, “Love your enemies”

and showing off DOES make people insecure and feel low for themselves. Sometimes, it makes people feel really jealous and have horrible thoughts of doing something to you. So, sometimes some people have really bad mental health But can be fixed.

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3 years ago

in a study of red/green color blindness, 600 men and 2150 women are randomly selected and tested. Among the men, 56 have red/gre

Umnica [9.8K]

Answer:

z=13.36 (Statistic)

$p_v =P(Z>13.36)\approx 0$

The p value is a very low value and using any significance level for example $\alpha=0.05, 0,1,0.15$ always $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can say the the proportion of men with red/green color blindness is significant higher than the proportion of female with red/green color blindness .

Step-by-step explanation:

1) Data given and notation

$X_{MCB}=56$ represent the number of men with red/green color blindness

$X_{WCB}=5$ represent the number of women with red/green color blindness

$n_{MCB}=600$ sample of male selected

$n_{WCB}=600$ sample of demale selected

$p_{MCB}=\frac{56}{600}=0.093$ represent the proportion of men with red/green color blindness

$p_{WCB}=\frac{5}{2150}=0.0023$ represent the proportion of women with red/green color blindness

z would represent the statistic (variable of interest)

$p_v$ represent the value for the test (variable of interest)

2) Concepts and formulas to use

We need to conduct a hypothesis in order to check if the proportion for men with red/green color blindness is a higher than the rate for women , the system of hypothesis would be:

Null hypothesis: $p_{MCB} \leq p_{WCB}$

Alternative hypothesis: $p_{MCB} > \mu_{WCB}$

We need to apply a z test to compare proportions, and the statistic is given by:

$t=\frac{p_{MCB}-p_{WCB}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{MCB}}+\frac{1}{n_{WCB}})}}$ (1)

Where $\hat p=\frac{X_{MCB}+X_{WCB}}{n_{MCB}+n_{WCB}}=\frac{56+5}{600+2150}=0.0221$

t-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.

3) Calculate the statistic

Replacing in formula (1) the values obtained we got this:

$z=\frac{0.093-0.0023}{\sqrt{0.0221(1-0.0221)(\frac{1}{600}+\frac{1}{2150})}}=13.36$

4) Statistical decision

For this case we don't have a significance level provided $\alpha$ , but we can calculate the p value for this test.

Since is a one side test the p value would be:

$p_v =P(Z>13.36)\approx 0$

So the p value is a very low value and using any significance level for example $\alpha=0.05, 0,1,0.15$ always $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can say the the proportion of men with red/green color blindness is significant higher than the proportion of female with red/green color blindness .

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3 years ago