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3 years ago

FAST ASAP!! WILL GIVE BRAINLIST ALOT OF POINTS

Mathematics

1 answer:

Alik [6]3 years ago

3 0

Answer:

= 3 3/4 m^2

or 15/4 m^2

Step-by-step explanation:

The base is the triangle.

A =1/2 bh

A = 1/2 (3 1/3 * 9/4)

Change 3 1/3 to an improper fraction (3*3+1)/3 = 10/3

A = 1/2 * 10/3 *9/4

Re arranging

= 1/2* 9/3 * 10/4

= 1/2 (3) 5/2

=15/4

Now writing as a mixed number

= 3 3/4 m^2

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A dolphin is at the surface of the ocean. What is the dolphin’s elevation?

Lelechka [254]

Answer:

It's elevation at the surface is 0, and the elevation twenty feet below is -20.

Step-by-step explanation:

The surface level is 0, and diving 20 feet under means 0 - 20, which is negative 20, or -20.

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2 years ago

What is the slope of the line shown

katovenus [111]

Answer:

-1/2

Step-by-step explanation:

Pick two points on the line

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2 years ago

Read 2 more answers

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Answer:

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Step-by-step explanation:

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3 years ago

A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly se

Darina [25.2K]

Answer: (17.42, 20.78)

Step-by-step explanation:

As per given , we have

Sample size : n= 9

$\overline{x}=19.1$ years

Population standard deviation is not given , so it follows t-distribution.

Sample standard deviation : s= 1.5 years

Confidence level : 99% or 0.99

Significance level : $\alpha= 1-0.99=0.01$

Degree of freedom : df= 8 (∵df =n-1)

Critical value : $t_c=t_{(\alpha/2,\ df)}=t_{0.005,\ 8}= 3.355$

The 99% confidence interval for the population mean would be :-

$\overline{x}\pm t_c\dfrac{s}{\sqrt{n}}$

$19.1\pm (3.355)\dfrac{1.5}{\sqrt{ 9}}\\\\=19.1\pm1.6775\\\\=(19.1-1.6775,\ 19.1+1.6775)\\\\=(17.4225,\ 20.7775)\approx(17.42,\ 20.78)$

Hence, the 99% confidence interval for the population mean is (17.42, 20.78) .

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3 years ago

3x+2y=0 <br> x-5y=17<br><br> Solving system using elimination

horsena [70]

(2,-3) is the answer

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2 years ago