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3 years ago

Solve the system by substitution. y = 7x– 45 Y = 2x

Mathematics

1 answer:

Assoli18 [71]3 years ago

4 0

Answer:

(x,y)=(9,18)

Step-by-step explanation:

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Triangle XYZ, X equals 27 cm, Y equals 79 cm and angle C equals 142Degrees. Find the length of Z, to the nearest centimeter.

Oksi-84 [34.3K]

Given:

In triangle XYZ, x = 27 cm, y = 79 cm and $\angle C=142^\circ$ .

To find:

The length of z.

Solution:

In triangle XYZ, using the Law of cosine, we get

$z^2=x^2+y^2-2xy\cos Z$

Putting the given values in the above formula, we get

$z^2=(27)^2+(79)^2-2(27)(79)\cos (142^\circ)$

$z^2=729+6241-4266(-0.788)$

$z^2=6970+3361.608$

$z^2=10331.608$

Taking square root on both sides.

$z=\pm \sqrt{10331.608}$

$z=\pm 101.6445178$

Approx the above value to the nearest number and side length cannot be negative. So,

$z\approx \pm 102\text{ cm}$

Therefore, the length of z is about 102 cm.

4 0

3 years ago

Read 2 more answers

The area of a rectangle is 21cm?.

Ghella [55]

Answer: The answer is − 5 plus per centimeter

Hope this helps :)

5 0

3 years ago

5(-2x-1)-5x+2=27 Solve for x

RSB [31]

Answer:

x = -2

Step-by-step explanation:

5(-2x - 1) = -10x -5

-10x -5 - 5x + 2 = 27

-15x -3 = 27

+3 +3

-15x = 30

x = -2

4 0

3 years ago

Read 2 more answers

Given a = -3 and b= 4 and c=-5, evaluate atb C -1/5 O 1/5 0 -7/5

stiv31 [10]

Answer:

I got - 5 as an answer.

I don't think I made a mistake.

Please if you find any error, contact me in the comment section.

Step-by-step explanation:

$a = -3 , b= 4 ,c= - 5\\(a+b)c\\(-3+4)-5\\(1)*(-5)\\Answer = -5$

8 0

3 years ago

Please help i have eman. I will mark brainlist

iragen [17]

Answer:

Step-by-step explanation:

8 0

2 years ago