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3 years ago

10

Answer quick please I’ll give you brainliest.

Advanced Placement (AP)

1 answer:

Evgesh-ka [11]3 years ago

4 0

Answer:

D: the globalization of consumer culture.

Explanation:

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What is important of geography

allsm [11]

Answer:

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3 years ago

Read 2 more answers

2. Find the solution of each differential equation. (a) y/2y-8y = 0 (b) 25y/- 20y + 4y = 0 (c) y + 2y + 2y = 0 2. Find the solut

jek_recluse [69]

Each of these ODEs is linear and homogeneous with constant coefficients, so we only need to find the roots to their respective characteristic equations.

(a) The characteristic equation for

$y'' - 2y' - 8y = 0$

is

$r^2 - 2r - 8 = (r - 4) (r + 2) = 0$

which arises from the ansatz $y = e^{rx}$ .

The characteristic roots are $r=4$ and $r=-2$ . Then the general solution is

$\boxed{y = C_1 e^{4x} + C_2 e^{-2x}}$

where $C_1,C_2$ are arbitrary constants.

(b) The characteristic equation here is

$25r^2 - 20r + 4 = (5r - 2)^2 = 0$

with a root at $r=\frac25$ of multiplicity 2. Then the general solution is

$\boxed{y = C_1 e^{2/5\,x} + C_2 x e^{2/5\,x}}$

(c) The characteristic equation is

$r^2 + 2r + 2 = (r + 1)^2 + 1 = 0$

with roots at $r = -1 \pm i$ , where $i=\sqrt{-1}$ . Then the general solution is

$y = C_1 e^{(-1+i)x} + C_2 e^{(-1-i)x}$

Recall Euler's identity,

$e^{ix} = \cos(x) + i \sin(x)$

Then we can rewrite the solution as

$y = C_1 e^{-x} (\cos(x) + i \sin(x)) + C_2 e^{-x} (\cos(x) - i \sin(x))$

or even more simply as

$\boxed{y = C_1 e^{-x} \cos(x) + C_2 e^{-x} \sin(x)}$

3 0

2 years ago

Hello everyone can someone tell me who can i delete these comments

Katarina [22]

Answer:

I don't understand wat u mean by dis

6 0

3 years ago

instead of focusing on how much they dread doing homework students should try to change their and realize what they are learning

saul85 [17]

This is a true statement. Instead of whining about schoolwork, we need to focus, and understand that school is preparing us for real life.
Hope this helps!
Stay smart,
~{Dunsforhands}

8 0

3 years ago

True or false- Gneiss is formed. The mineral grains in granite are flattened under pressure.

Vladimir79 [104]

Answer:

The correct answer is True

5 0

3 years ago