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3 years ago

I NEED HELP PLEASE IT WOULD REALLY MEAN AOT !!!! NO ZOOMS OR LINKS!!!!

Mathematics

1 answer:

Reika [66]3 years ago

5 0

Answer:

20.78

Step-by-step explanation:

sin a = perpendicular/ hypotenuse

where a is the base angle

here a = 60

sin 60 = 18/ x

since,

$\sin(60) = \ \frac{ \sqrt{3} }{2}$

$\frac{ \sqrt{3} }{2} = \frac{18}{x}$

√3 x = 36

x = 36/ √3

x = 36/ 1.732

x = 20.78

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The point (-1,4)is translated five units right and three units down.which rule describes the translation

xz_007 [3.2K]

Answer:

(x, y ) → (x + 5, y - 3 )

Step-by-step explanation:

5 units right means add 5 to the x- coordinate

3 units down means subtract 3 from the y- coordinate

the translation rule is

(x, y ) → (x + 5, y - 3 )

5 0

3 years ago

A researcher reports the following confidence interval for a comparison of the difference between two groups: 95% CI −12.0 [−30.

Lapatulllka [165]

Answer:

Decision: Support the null hypothesis.

Sample mean: -12

Step-by-step explanation:

Hello!

When deciding with a Confidence interval you have to keep in mind that the following conditions are met:

The hypothesis and the interval are made for the same parameter.
The hypothesis should be two-tailed.
The interval and the test have to have complementary confidence and signification levels. This means that if the interval is made with 1 - α= 0.95 the hypothesis test should be made with α= 0.05.

H₀: μ₁ - μ₂= 0

H₁: μ₁ - μ₂≠ 0

α: 0.05

If the interval contains the cero, it means that there is no difference between the means, so you support the null hypothesis.

If the interval doesn't contain the cero, there is a difference between the two means, so you reject the null hypothesis.

The intervals to estimate the population mean have the following structure:

Estimator ± Margin of error

This means that the sample mean (point estimate of the population mean) is in the middle of the calculated interval. To know it's the value you have to do a simple calculation:

sample mean: $\frac{Upper bound + Lower bound}{2}$

sample mean: $\frac{6 + (-30)}{2}$

sample mean: -12

I hope it helps!

7 0

4 years ago

Arlene had some blackberries. She gave 216 to her teachers. Then she dropped 12. Later, she ate 18. Finally, she gave half of wh

Bingel [31]

Answer:the number of BlackBerry that Arlene had initially was 276

Step-by-step explanation:

Let x represent the number of BlackBerry that Arlene had initially.

She gave 216 to her teachers. This means that she is left with x - 216

Then she dropped 12. This means that she would be left with x - 216 - 12 = x - 228

Later, she ate 18. This means that she would be left with x - 228 - 18 = x - 246

Finally, she gave half of what she had to her friend. This means that the amount that she gave to her friend is (x - 246)/2 and the amount that she has left would be

(x - 246)/2

Now, she has 15. This means that

(x - 246)/2 = 15

x - 246 = 2 × 15 = 30

x = 30 + 246 = 276

7 0

3 years ago

Find the missing value.

mixas84 [53]

Answer:

-4 = 5 - 9

Step-by-step explanation:

-4 = ? - 9

Add 9 to -4

5

The result of -4 = ? - 9 is 5

-4 = 5 - 9

-4 = -4

3 0

3 years ago

Shau-uen solve the equation 18.5w+6.5w-2.8w=149.1 Her work is shown below

Ghella [55]

The answer is

C.- step 3

5 0

3 years ago

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