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3 years ago

Can someone please help, ty!! (Will mark brainliest)

Mathematics

2 answers:

Oliga [24]3 years ago

7 0

Answer:

Arcadia

Step-by-step explanation:

the line in the box is the median and Arcadia is bigger than Millersburg

Sergeeva-Olga [200]3 years ago

3 0

Answer:

millersburg

Step-by-step explanation:

hope this helps srry if it doesn't

plz mark me brainlist

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Write a description of the inequality.

MrMuchimi

Answer:

C > 9

Step-by-step explanation:

1/2 (c + 1) ≥ 5

1/2c + 1/2 ≥ 5

1/2c + 1/2 - 1/2 ≥ 5 - 1/2 = 1/2c ≥ 9/2

2(1/2c) ≥ 2(9/2)

c ≥ 9

5 0

3 years ago

Which two lines are parallel? 5y = 2x-5 5y= 4 + 3x 5y- 3x = -1

drek231 [11]

Answer:

5y=4+3x, 5y-3x=-1

Step-by-step explanation:

To be parallel they must have different constants but the same slope.

5y-3x=-1

5y=-1+3x and 5y=4+3x fit these requirements.

6 0

3 years ago

the sum of areas of two circles is 80 square meters find the lencgh of radius of each circles if one of them is twice as larger

klemol [59]

Area of a cirlce=πr²
we have two radius:2r and r
area of the cirlce₁ + area of the circle₂=80 m²
area of the circle₁=π(2r)²
area of the circle₂=πr²
Then, we can suggest this quation:

π(2r)²+πr²=80

4πr²+πr²=80
π(4r²+r²)=80
π(5r²)=80
5πr²=80
r²=80/5π
r=√(80/5π)≈2.26

radius of the largest cirlce=2r=2(2.26)=4.51

Answer: the radius of the largest circle is 4.51 m

6 0

4 years ago

Read 2 more answers

PLEASE HELPPPPPPPPPPPP ME! THANK YOU!

Ainat [17]

Answer:

x=0

x=10

x=24

Step-by-step explanation:

f(x) = -.05x^2 + x +6

The initial value is 6 ( Let x=0 and f(0) = 6)

f(x) = -.05( x^2 -20 x -120)

I plotted the equation and maximum is at x=10 and the zero is at x=25

3 0

4 years ago

Sacramento County high school seniors have an average SAT score of 1,020. From a random sample of 144 Sacramento High School stu

kari74 [83]

Answer:

We need to conduct a hypothesis in order to check if the high school students are representative of the overall population (or if the true mean is 1020 or not), the system of hypothesis would be:

Null hypothesis: $\mu = 1020$

Alternative hypothesis: $\mu \neq 1020$

Step-by-step explanation:

Previous concepts and data given

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=1100$ represent the sample mean

$s=144$ represent the sample standard deviation

n=144 represent the sample selected

$\alpha$ significance level

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the high school students are representative of the overall population (or if the true mean is 1020 or not), the system of hypothesis would be:

Null hypothesis: $\mu = 1020$

Alternative hypothesis: $\mu \neq 1020$

If we analyze the size for the sample is > 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$t=\frac{1100-1020}{\frac{144}{\sqrt{144}}}=6.67$

P-value

First we need to calculate the degrees of freedom given by:

$df=n-1=144-1 =143$

Then since is a two sided test the p value would be:

$p_v =2*P(t_{144}>6.67)=2.59x10^{-10}$

Conclusion

If we compare the p value and a significance level for example $\alpha=0.05$ we see that $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the population mean is significant different from 1020 at 5% of significance.

6 0

3 years ago