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tekilochka [14]
4 years ago
10

Which polygon has an interior angle sum of 1260

Mathematics
2 answers:
lisov135 [29]4 years ago
4 0
That polygon is a nonagon.
marta [7]4 years ago
4 0

Answer:

the one with 9 dots is the answer so

the answer is C

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Y''+y'+y=0, y(0)=1, y'(0)=0
mars1129 [50]

Answer:

y=e^{\frac{-t}{2}}\left ( \cos\left ( \frac{\sqrt{3}t}{2} \right )+\frac{1}{\sqrt{3}}\sin \left ( \frac{\sqrt{3}t}{2} \right ) \right )

Step-by-step explanation:

A second order linear , homogeneous ordinary differential equation has form ay''+by'+cy=0.

Given: y''+y'+y=0

Let y=e^{rt} be it's solution.

We get,

\left ( r^2+r+1 \right )e^{rt}=0

Since e^{rt}\neq 0, r^2+r+1=0

{ we know that for equation ax^2+bx+c=0, roots are of form x=\frac{-b\pm \sqrt{b^2-4ac}}{2a} }

We get,

y=\frac{-1\pm \sqrt{1^2-4}}{2}=\frac{-1\pm \sqrt{3}i}{2}

For two complex roots r_1=\alpha +i\beta \,,\,r_2=\alpha -i\beta, the general solution is of form y=e^{\alpha t}\left ( c_1\cos \beta t+c_2\sin \beta t \right )

i.e y=e^{\frac{-t}{2}}\left ( c_1\cos\left ( \frac{\sqrt{3}t}{2} \right )+c_2\sin \left ( \frac{\sqrt{3}t}{2} \right ) \right )

Applying conditions y(0)=1 on e^{\frac{-t}{2}}\left ( c_1\cos\left ( \frac{\sqrt{3}t}{2} \right )+c_2\sin \left ( \frac{\sqrt{3}t}{2} \right ) \right ), c_1=1

So, equation becomes y=e^{\frac{-t}{2}}\left ( \cos\left ( \frac{\sqrt{3}t}{2} \right )+c_2\sin \left ( \frac{\sqrt{3}t}{2} \right ) \right )

On differentiating with respect to t, we get

y'=\frac{-1}{2}e^{\frac{-t}{2}}\left ( \cos\left ( \frac{\sqrt{3}t}{2} \right )+c_2\sin \left ( \frac{\sqrt{3}t}{2} \right ) \right )+e^{\frac{-t}{2}}\left ( \frac{-\sqrt{3}}{2} \sin \left ( \frac{\sqrt{3}t}{2} \right )+c_2\frac{\sqrt{3}}{2}\cos\left ( \frac{\sqrt{3}t}{2} \right )\right )

Applying condition: y'(0)=0, we get 0=\frac{-1}{2}+\frac{\sqrt{3}}{2}c_2\Rightarrow c_2=\frac{1}{\sqrt{3}}

Therefore,

y=e^{\frac{-t}{2}}\left ( \cos\left ( \frac{\sqrt{3}t}{2} \right )+\frac{1}{\sqrt{3}}\sin \left ( \frac{\sqrt{3}t}{2} \right ) \right )

3 0
3 years ago
What is x? I can never deal with negative numbers... :(<br><br> 2x=-6
Mkey [24]
2x=-6\\&#10;x=-3
8 0
3 years ago
Read 2 more answers
40 identical machines in a factory pack
Vlad [161]

(a)The ratio of the number of machine to the number of crates packed is 1:4.5

(b)  crates of oranges in 90  pack per day by machine is  405.

What is Ratio?

An ordered pair of numbers a and b, represented as a / b, is a ratio if b is not equal to 0. A proportion is an equation that sets two ratios at the same value. For instance, you could express the ratio as follows: 1: 3 if there is 1 boy and 3 girls (for every one boy there are 3 girls)

Given that;

40 identical machines in a factory pack 180 crates of oranges per day

So,

a) The ratio of the number  of machines to the number of crates packed per day  is:

40/180 = 1:4.5

b) crates of oranges would 90 of these machines pack per day is

40/180 = 90/x

x = \frac{180\times 90}{40}

x = 4.5 x 90

x = 405

Learn more about Ratio click here:

brainly.com/question/2914376

#SPJ1

7 0
1 year ago
Use addition to solve the linear system of equations.
Degger [83]

Answer:

(4,-5)

Step-by-step explanation:

Y = 3-2X

8X +5(3-2X) =7

8x + 15 - 10x = 7

-2x = -8

x = 4

y = 3 - 2(4)

y = -5

8 0
3 years ago
Given triangle STU equal to KLM complete each of the following statements TU= KM= LK=
SVEN [57.7K]

Answer:

TU = LM

KM = SU

LK = TS

Step-by-step explanation:

It is given that ΔSTU ≅ ΔKLM

Since, the corresponding parts of congruence triangle are equal,

The corresponding sides TU of ΔSTU and LM of ΔKLM are equal.

The corresponding sides KM of ΔKLM and SU of ΔSTU are equal.

The corresponding sides LK of ΔKLM and TS of ΔSTU are equal.

Hence,

TU = LM

KM = SU and

LK = TS

6 0
3 years ago
Read 2 more answers
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