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2 years ago

Find the difference: 20 - 80 -12-15

Mathematics

2 answers:

zavuch27 [327]2 years ago

8 0

Answer: -87

Step-by-step explanation:

Fudgin [204]2 years ago

6 0

Answer:

-60 and then -27 is the answer

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Which is a correct reflection statement?

algol13

Answer:

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2 years ago

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horrorfan [7]

Answer:

Is D

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3 years ago

ANSWER FAST!!!!!!!

Lemur [1.5K]

Answer:

The angle between the 190 ft. side and the 330 ft. side is $57.9^o$

Step-by-step explanation:

<u>The Law of Cosines</u>

When we know the value of all sides of a triangle, we can compute all of its interior angles by using the Law of Cosines, which is a generalization of the Pythagoras's theorem. If a,b, and c are the known sides of a triangle and $\alpha$ is the angle formed by sides a and b (opposite to c), then

$\displaystyle c^2=a^2+b^2-2ab\ cos\alpha$

We'll use the values a=190, b=330, c=280 because we want to compute the angle opposite to c

$\displaystyle cos\alpha =\frac{a^2+b^2-c^2}{2ab}$

$\displaystyle cos\alpha =\frac{190^2+330^2-280^2}{2(190)(330)}$

$\displaystyle cos\alpha =\frac{36100+108900-78400}{125400}$

$\displaystyle cos\alpha =\frac{66600}{125400}=0,5311$

$\displaystyle \alpha= arccos\ 0.5311$

$\boxed{\displaystyle \alpha= 57.9^o}$

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atroni [7]

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Answer:

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Step-by-step explanation:

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