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3 years ago

15

PLEASE HELP LAW OF COSINES

2 answers:

RoseWind [281]3 years ago

8 0

Answer:

34 degrees

Step-by-step explanation:

edg quiz

chubhunter [2.5K]3 years ago

7 0

The Law of Cosine states
cos $C=(a^2+b^2-c^2)/2ab$

so plugging in the numbers gives us

cos $J=(13^2+19^2-11^2)/2(13*19) = 409/494$

We now have cosJ so plug that into your calculator and find arccos (arccos(cos(J)) = J)
arccos $(409/494)=34.11$
rounding your answer will give you 34°

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2.<br> Which of the functions below is an inverse of the quadratic function f(x) = x2 - 3 ?

mezya [45]

Answer:

the inverse of the quadratic function $f(x) = x^2 - 3$ is $\mathbf{f^{-1}(x)=\pm \sqrt{x+3}}$

Step-by-step explanation:

We need to find inverse of the quadratic function $f(x) = x^2 - 3$

Let

$y=x^2-3$

Replace x and y

$x=y^2-3$

Now, we will solve for y

Adding 3 on both sides

$x+3=y^2-3+3$

$x+3=y^2$

Taking square root on both sides

$\sqrt{y^2}=\sqrt{x+3}\\y=\pm \sqrt{x+3}$

Now replace y with $f^{-1}(x)$

$f^{-1}(x)=\pm \sqrt{x+3}$

So, the inverse of the quadratic function $f(x) = x^2 - 3$ is $\mathbf{f^{-1}(x)=\pm \sqrt{x+3}}$

3 0

3 years ago

Please me help me help me

Oksana_A [137]

Answer:

Its 60 degrees

Step-by-step explanation:

Opposite angles are equal so then CGE is the same as FGD and since angle CGB is a right angle we can subract the 30 from 90 and get a 60

6 0

2 years ago

How the graph of y=2x is the same and different from the graph of y=2x-7

solong [7]

The graphs have the same slope (2) and are parallel

The difference is the y intercept

y = 2x has as y intercept of 0

where y = 2x-7 has a y intercept of -7

8 0

3 years ago

Read 2 more answers

Ms. Webb said that 50% of her students made a B, 20% made a C, and the rest of her students

aleksandrvk [35]

Based on the percentage of students making the other grades, the number of students Ms. Webb has is<u> 110 students. </u>

<h3>Percentage of students with A</h3>

= 100% - Percentages of other grades

= 100% - 50% - 20%

= 30%

<em>30% of students made A. </em>

<h3>Number of students in class. </h3>

The number of students can be found by the formula:

<em>= Number of students with A / Percentage of students with A</em>

= 33 / 30%

= 110 students

In conclusion, there were 110 students.

Find out more on percentages at brainly.com/question/11570843

5 0

2 years ago

Plz solve I’m in a hurry (-4)-7

yKpoI14uk [10]

The answer is -11 hope it helps

6 0

3 years ago

Read 2 more answers