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3 years ago

Find the function value. cos150°

Mathematics

1 answer:

Paladinen [302]3 years ago

7 0

Answer:

$cos150 = -\frac{\sqrt{3} }{2}$

Step-by-step explanation:

Recall the unit circle. At 150 deg, the point value is (-sqrt3/2, 1/2)

Remember the cosine is always the x-value, and sine is always the y-value.

This means that cosine will be -sqrt3/2.

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I WILL GIVE YOU BRAINLIEST 25 POINTS ASAP NO LINKS

maw [93]

Answer:

C) 3

I played a while with desmos. when I diverge from c=3 it seems impossible to fit the graph even remotely to the point, the lowest point won't fit if it isn't 3

note that it's still just the best approximation out of the 4 given options

6 0

3 years ago

Mr. Good Wrench advertises that a customer will have to wait no more than 30 minutes for an oil change. A sample of 26 oil chang

Andru [333]

Answer:

The 90% confidence interval for the population standard deviation waiting time for an oil change is (3.9, 6.3).

Step-by-step explanation:

The (1 - α)% confidence interval for the population standard deviation is:

$CI=\sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{\alpha/2, (n-1)}}}\leq \sigma\leq \sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{1-\alpha/2, (n-1)}}}$

The information provided is:

n = 26

s = 4.8 minutes

Confidence level = 90%

Compute the critical values of Chi-square as follows:

$\chi^{2}_{\alpha/2, (n-1)}=\chi^{2}_{0.10/2, (26-1)}=\chi^{2}_{0.05, 25}=37.652$

$\chi^{2}_{1-\alpha/2, (n-1)}=\chi^{2}_{1-0.10/2, (26-1)}=\chi^{2}_{0.95, 25}=14.611$

*Use a Chi-square table.

Compute the 90% confidence interval for the population standard deviation waiting time for an oil change as follows:

$CI=\sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{\alpha/2, (n-1)}}}\leq \sigma\leq \sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{1-\alpha/2, (n-1)}}}$

$=\sqrt{\frac{(26-1)\times 4.8^{2}}{37.652}}\leq \sigma\leq \sqrt{\frac{(26-1)\times 4.8^{2}}{14.611}}\\\\=3.9113\leq \sigma\leq 6.2787\\\\\approx 3.9 \leq \sigma\leq6.3$

Thus, the 90% confidence interval for the population standard deviation waiting time for an oil change is (3.9, 6.3).

3 0

3 years ago

I get up at 6:30, how many hours do I get to sleep in if there's a 2 hour delay?

ElenaW [278]

Answer:

8:30

Step-by-step explanation:

well it's a delay so you will have to add

6:30 + 2 = 8:30

5 0

3 years ago

Read 2 more answers

(2 + 10) x5 = (2 x 5) =(__x 5)

statuscvo [17]

10, 2+10=12x5=60 so when you have 2x5, which is 10, +_x5, you need to find a way to make it equal 50, so 10x5
i explained it bad sorry

4 0

3 years ago

NEED HELP ASAP!!! Will give brainliest!!!

Gekata [30.6K]

Answer:

1, 4/5,2/5

Step-by-step explanation:

y = 5x

Let y = 5

5 = 5x

Divide by 5

5/5 =5x/5

1=x

Let y=4

4 =5x

Divide by 5

4/5 =5x/5

4/5 =x

Let y=2

2 =5x

Divide by 5

2/5 =5x/5

2/5 =x

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4 years ago