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PtichkaEL [24]
3 years ago
11

Pls Answer Quickly!NO LINKS OR IRRELAVENT PICTURES

Mathematics
1 answer:
Ratling [72]3 years ago
3 0

Answer:

Option B

Step-by-step explanation:

Given that cosθ = -\frac{3}{10}

Since, θ is an angle in quadrant II therefore, cosine value is negative

Now we will find the tangent ratio from the given triangle.

tanθ = \frac{\text{Opposite side}}{\text{Adjacent side}}

From the given triangle,

By applying Pythagoras theorem in the given right triangle,

AC² = AB² + BC²

AB² = 10² - 3²

       = 100 - 9

       = 91

AB = √91

tanθ = \frac{AB}{BC}

Now, tanθ = \frac{\sqrt{91} }{3}

Since, θ is in second quadrant therefore, tangent of the angle will be negative.

tanθ = -\frac{\sqrt{91} }{3}

Option B is the answer.

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HELP! WILL GIVE BRAINLEST
trasher [3.6K]

Answer:

Option C: 41

Step-by-step explanation:

<ABD+<CBD=90

<ABD=8x+1

<CBD=6x+5

(8x+1)+(6x+5)=90

Combine like terms

(8x+6x)+(1+5)=90

14x+6=90

14x=90-6

14x=84

divide both sides by 14

x=6

Now we plug that value into <DBC = 6x+5

6(6)+5=

36+5

41

7 0
1 year ago
Read 2 more answers
Which of the following is the correct factorization of the polynomial below?<br> x3 + 14x2 + 49x
Naddika [18.5K]

For this case we must factor the following polynomial:

x ^ 3 + 14x ^ 2 + 49x\\

We can take common factor x:

x(x ^ 2+ 14x + 49)

To factor the expression within the parenthesis, we must find two numbers that when multiplied give 49 and when added together, 14 are obtained. These are: 7 and 7.

7*7=49,7+7=14

Thus, the expression is factored as:

x(x + 7)(x +7)

Answer:

x (x + 7) ^ 2

7 0
3 years ago
Read 2 more answers
I need help to find the answer
marin [14]

Answer: 1 one

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3 0
3 years ago
The population of Portland Oregon has recently grown to more than 500,000. What is the order of magnitude for the number of peop
miss Akunina [59]

Answer:

Order is 6

Step-by-step explanation:

The population of Portland Oregon has recently grown to more than 500,000.

The order of magnitude for the number of people in Portland means the power of 10. It means that we need to write 500,000 in form of 10 to the power. So,

P=500,000

It contains 6 zeroes. It means,

P=5\times 10^6

So, the order of magnitude for the number of people in Portland is 6.

5 0
3 years ago
Consider a drug testing company that provides a test for marijuana usage. Among 310 tested​ subjects, results from 28 subjects w
Naily [24]

Answer:

z=\frac{0.0903 -0.1}{\sqrt{\frac{0.1(1-0.1)}{310}}}=-0.569  

The p value for this case can be calculated with this probability:

p_v =P(z  

Since the p value is higher than significance level we don't have enough evidence to conclude that the true proportion is significantly less than 0.1

Step-by-step explanation:

Information given

n=310 represent th sample selected

X=28 represent the subjects wrong

\hat p=\frac{28}{310}=0.0903 estimated proportion of subjects wrong

p_o=0.1 is the value to verify

\alpha=0.05 represent the significance level

t would represent the statistic

p_v represent the p value

System of hypothesis

We want to test the claim that less than 10 percent of the test results are wrong ,and the hypothesis are:  

Null hypothesis:p\geq 0.1  

Alternative hypothesis:p < 0.1  

The statistic is given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Replacing the info we got:

z=\frac{0.0903 -0.1}{\sqrt{\frac{0.1(1-0.1)}{310}}}=-0.569  

The p value for this case can be calculated with this probability:

p_v =P(z  

Since the p value is higher than significance level we don't have enough evidence to conclude that the true proportion is significantly less than 0.1

5 0
3 years ago
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