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vlada-n [284]
3 years ago
11

Find the area of the regular polygon

Mathematics
1 answer:
Over [174]3 years ago
8 0

Answer: i feel it is D from my experience

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Which property is shown (5×3)+(5×9)=5×(3+9)
mote1985 [20]
Resolve to do so
5x3=15 
5x9=45 
3+9=12
15+45=5x12 
15+45=60 
5x12=60 
60=60
Which property is shown I did not understand but I think with the result 60 = 60 alone, but you will understand if you can not send me a comment, so I'll try to make you understand  =)

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3 years ago
All of the following expressions represent the sum of n and itself, except _____.
DochEvi [55]
N^2 because 2n is the same as n+n, but n^2 is the same as the product of n and n
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Divide R120 in the ratio 3:2
Fynjy0 [20]

Answer:

72:48

Step-by-step explanation:

as you divide 120 by 5 as 3+2=5 and that equals 24

24x3=72

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Ray BD bisects ABC so that m 2DBC = (x + 6)° and m ZABD = (2x – 12). What is x?
Ludmilka [50]
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5 0
3 years ago
In a study of parents' perceptions of their children's size, researchers asked parents to estimate their youngest child's height
tatyana61 [14]

Answer:

Test statistic t=6.505

P-value=0

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that parents tend to underestimate their youngest child's size.

Then, the null and alternative hypothesis are:

H_0: \mu=0\\\\H_a:\mu> 0

The significance level is assumed to be 0.05.

The sample has a size n=39.

The sample mean is M=7.5.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=7.2.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{7.2}{\sqrt{39}}=1.153

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{7.5-0}{1.153}=\dfrac{7.5}{1.153}=6.505

The degrees of freedom for this sample size are:

df=n-1=39-1=38

This test is a right-tailed test, with 38 degrees of freedom and t=6.505, so the P-value for this test is calculated as (using a t-table):

P-value=P(t>6.505)=0

As the P-value (0) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is  enough evidence to support the claim that parents tend to underestimate their youngest child's size.

5 0
3 years ago
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