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emmainna [20.7K]

3 years ago

13

Help!! I need help with my math!!

2 answers:

Firlakuza [10]3 years ago

5 0

Step-by-step explanation:

$thank \: you$

Vlad [161]3 years ago

4 0

50+75=125
125-180=55
The answer equal to 55

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If the sales tax rate is 6%, find the tax on a $429.95 television to the nearest cent.

dexar [7]

Answer:

25.800

Step-by-step explanation:

6 persecnt of 429.95 is 25.800 rounded if you need it where i subtract it from the total its 404.150 or 404.15

8 0

3 years ago

Use the substitution of x=e^{t} to transform the given Cauchy-Euler differential equation to a differential equation with consta

kherson [118]

By the chain rule,

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\mathrm dy}{\mathrm dt}\dfrac{\mathrm dt}{\mathrm dx}\implies\dfrac{\mathrm dy}{\mathrm dt}=x\dfrac{\mathrm dy}{\mathrm dx}$

which follows from $x=e^t\implies t=\ln x\implies\dfrac{\mathrm dt}{\mathrm dx}=\dfrac1x$ .

$\dfrac{\mathrm dy}{\mathrm dt}$ is then a function of $x$ ; denote this function by $f(x)$ . Then by the product rule,

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm d}{\mathrm dx}\left[\dfrac1x\dfrac{\mathrm dy}{\mathrm dt}\right]=-\dfrac1{x^2}\dfrac{\mathrm dy}{\mathrm dt}+\dfrac1x\dfrac{\mathrm df}{\mathrm dx}$

and by the chain rule,

$\dfrac{\mathrm df}{\mathrm dx}=\dfrac{\mathrm df}{\mathrm dt}\dfrac{\mathrm dt}{\mathrm dx}=\dfrac1x\dfrac{\mathrm d^2y}{\mathrm dt^2}$

so that

$\dfrac{\mathrm d^2y}{\mathrm dt^2}-\dfrac{\mathrm dy}{\mathrm dt}=x^2\dfrac{\mathrm d^2y}{\mathrm dx^2}$

Then the ODE in terms of $t$ is

$\dfrac{\mathrm d^2y}{\mathrm dt^2}+8\dfrac{\mathrm dy}{\mathrm dt}-20y=0$

The characteristic equation

$r^2+8r-20=(r+10)(r-2)=0$

has two roots at $r=-10$ and $r=2$ , so the characteristic solution is

$y_c(t)=C_1e^{-10t}+C_2e^{2t}$

Solving in terms of $x$ gives

$y_c(x)=C_1e^{-10\ln x}+C_2e^{2\ln x}\implies\boxed{y_c(x)=C_1x^{-10}+C_2x^2}$

4 0

3 years ago

Need help oooooooook

Komok [63]

Answer:

22222

Step-by-step explanation:

22222222

7 0

2 years ago

Please help this is due today!

Klio2033 [76]

Answer:

x=63+86

Step-by-step explanation:

due to circle theory

3 0

2 years ago

Rectangle A has side lengths of 6\text{ cm}6 cm6, start text, space, c, m, end text and 3.5\text{ cm}3.5 cm3, point, 5, start te

sergiy2304 [10]

The side lengths of rectangle is 3 cm and 1.75 cm and 5.25 cm and 9 cm.

According to the statement

we have given that Rectangle A has side lengths of 6 cm and 3.5 cm

And The side lengths of rectangle B are proportional to the side lengths of rectangle A.

And we have to Find that the What could be the side lengths of rectangle B?

A 3 cm and 1.75 cm

B 5 cm and 2.5 cm

C 7 cm and 7 cm

D 12 cm and 5 cm

E 5.25 cm and 9 cm

Here we see that the side B are proportional to side length A of rectangle.

So,

Let say sides of rectangle B are a and b corresponding to sides 6 and 3.5 cm

=> a/6 = b/3.5

=> a/b = 6/3.5

=> a/b = 12/7

A 3 cm and 1.75 cm

3/1.75 = 12/7

Hence this is proportional

B 5 cm and 2.5 cm

5/2.5 = 2 ≠ 12/7

Not Proportional

C 7 cm and 7 cm

7/7 = 1 ≠ 12/7

Not Proportional

D 12 cm and 5 cm

12/5 ≠ 12/7

Not Proportional

E 5.25 cm and 9 cm

9/5.25 = 36/21 = 12/7

Hence this is proportional

So, 3 cm and 1.75 cm and 5.25 cm and 9 cm could be the side lengths of rectangle B.

Learn more about Rectangles here brainly.com/question/18019422

#SPJ1

3 0

2 years ago