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Over [174]
3 years ago
14

Let u solve cu = 0. Show that any derivative, say w = uxt, also solves cw = 0. In cu = 0, u = u(t, x) do the change of variables

(ξ, η) specified below, to find the equation for v(ξ, η). Is it vξξ − c 2vηη = 0? (a) Translation ξ = t − T, η = x − y where y, T are fixed. (b) Dilation ξ = at, η = ax for any constant a. (c) Find the change of variables (ξ, η) = (?, ?) such that v(ξ, η) satisfies 1v = vξξ −vηη = 0

Mathematics
1 answer:
hjlf3 years ago
4 0

Answer:

See the pictures attached

Step-by-step explanation:

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90. The number of daily evening newspapers in the United States has decreased by 46.5% to
aleksandr82 [10.1K]

Answer:

700

Step-by-step explanation:

Given:

Daily evening newspapers in 2015 = 389

Percentage decrease from 2000 to 2015 = 46.5%

To find:

Number of newspapers in 2000 = ?

Solution:

Let the number of newspapers in 2000 = x

When 46.5% of the total newspapers in 2000 (x) is subtracted from the total  newspapers in 2000 (x), it will be equal to the number of newspapers in 2015.

Making the equation as per the given statement:

x-x\times 46.5\%=389\\\Rightarrow \dfrac{100x-46.5x}{100}=389\\\Rightarrow 53.5x=38900\\\Rightarrow x\approx \bold{727}

Therefore, the answer is:

There were <em>727 </em>newspapers in 2000.

7 0
3 years ago
You have $1000 you want to save, but you don’t want to put it into a savings account the pays only 0.5% per year. Instead, you h
just olya [345]

Answer:

$30

Step-by-step explanation:

If the CD paid back 3% interest of the money you put in, all you have to find is what 3% of $1000 is.

3% = 0.03.

0.03 x 1000 is $30.

You earned $30 in interest.

5 0
3 years ago
What is the second term of the expression 2x + 3x + 5
mojhsa [17]

Answer:

2x + 3x + 5= 10x

Step-by-step explanation:

4 0
3 years ago
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What is e * 6 - 4 * 1 ​
nalin [4]

Answer:

14 is the answer if you mean 3 by that e

6 0
3 years ago
I’m not quite good in geometry so please help
Anna [14]

Answer:

7x+33

Step-by-step explanation:

6x+x=7x+33 hope this answer helps you

3 0
3 years ago
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