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2 years ago

My guys do you thing I am giving brainliest

Mathematics

1 answer:

vampirchik [111]2 years ago

5 0

Answer: B

Step-by-step explanation:

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Find the percentage decrease when 94 decreases to 23.5

AveGali [126]

Answer:

75%

Step-by-step explanation:

(94-23.5)/(94)*100=75%

4 0

2 years ago

Read 2 more answers

Help please thanks!!!!!!!!!!

sergeinik [125]

The answer is b please be thankful

6 0

3 years ago

How many positive four-digit integer palindromes have 12 as the sum of the digits of the number?

Sindrei [870]

2442
2+4+4+2=12

3333
3+3+3+3=12

1551
1+5+5+1=12

4224
4+2+2+4=12

5115
5+1+1+5=12

6006
6+0+0+6=12

The answer is 6

8 0

2 years ago

Answer fast PLEASE!!! :)

PSYCHO15rus [73]

Answer:

i would say... maybe a or c

Step-by-step explanation:

im not sure

5 0

2 years ago

Find a linear second-order differential equation f(x, y, y', y'') = 0 for which y = c1x + c2x3 is a two-parameter family of solu

Alisiya [41]

Let $y=C_1x+C_2x^3=C_1y_1+C_2y_2$ . Then $y_1$ and $y_2$ are two fundamental, linearly independent solution that satisfy

$f(x,y_1,{y_1}',{y_1}'')=0$
$f(x,y_2,{y_2}',{y_2}'')=0$

Note that ${y_1}'=1$ , so that $x{y_1}'-y_1=0$ . Adding $y''$ doesn't change this, since ${y_1}''=0$ .

So if we suppose

$f(x,y,y',y'')=y''+xy'-y=0$

then substituting $y=y_2$ would give

$6x+x(3x^2)-x^3=6x+2x^3\neq0$

To make sure everything cancels out, multiply the second degree term by $-\dfrac{x^2}3$ , so that

$f(x,y,y',y'')=-\dfrac{x^2}3y''+xy'-y$

Then if $y=y_1+y_2$ , we get

$-\dfrac{x^2}3(0+6x)+x(1+3x^2)-(x+x^3)=-2x^3+x+3x^3-x-x^3=0$

as desired. So one possible ODE would be

$-\dfrac{x^2}3y''+xy'-y=0\iff x^2y''-3xy'+3y=0$

(See "Euler-Cauchy equation" for more info)

6 0

3 years ago