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2 years ago

Please Help me asap!!

Mathematics

2 answers:

timofeeve [1]2 years ago

7 0

Answer:

z -2 = 10

Step-by-step explanation:

11z-9-10z+7 = 10

Combine like terms on the left side

11z -10z -9+7 =10

z -2 = 10

Mademuasel [1]2 years ago

3 0

Answer: z=12

Step-by-step explanation:

$11z-9-10z+7=10\\z-9+7=10\\z-2=10\\z=12$

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Please help with math

xenn [34]

Answer:

C=2pi

Step-by-step explanation:

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3 years ago

Trying to solve this problem but I can’t

vlabodo [156]

Answer:

option c I think as the correct answer.

Step-by-step explanation:

hope this helps you.

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2 years ago

Read 2 more answers

Two solutions to y'' – 2y' – 35y = 0 are yı = e, Y2 = e -5t a) Find the Wronskian. W = 0 Preview b) Find the solution satisfying

pashok25 [27]

Answer:

a. $w(t)=-12e^{2t}$

b. $y(t)=-\frac{9}{2}e^{7t}-\frac{5}{2}e^{-5t}$

Step-by-step explanation:

We have a differential equation

y''-2 y'-35 y=0

Auxillary equation

$(D^2-2D-35)=0$

By factorization method we are finding the solution

$D^2-7D+5D-35=0$

$(D-7)(D+5)=0$

Substitute each factor equal to zero

D-7=0 and D+5=0

D=7 and D=-5

Therefore ,

General solution is

$y(x)=C_1e^{7t}+C_2e^{-5t}$

Let $y_1=e^{7t} \;and \;y_2=e^{-5t}$

We have to find Wronskian

$w(t)=\begin{vmatrix}y_1&y_2\\y'_1&y'_2\end{vmatrix}$

Substitute values then we get

$w(t)=\begin{vmatrix}e^{7t}&e^{-5t}\\7e^{7t}&-5e^{-5t}\end{vmatrix}$

$w(t)=-5e^{7t}\cdot e^{-5t}-7e^{7t}\cdot e^{-5t}=-5e^{7t-5t}-7e^[7t-5t}$

$w(t)=-5e^{2t}-7e^{2t}=-12e^{2t}$

a. $w(t)=-12e^{2t}$

We are given that y(0)=-7 and y'(0)=23

Substitute the value in general solution the we get

$y(0)=C_1+C_2$

$C_1+C_2=-7$ ....(equation I)

$y'(t)=7C_1e^{7t}-5C_2e^{-5t}$

$y'(0)=7C_1-5C_2$

$7C_1-5C_2=23$ ......(equation II)

Equation I is multiply by 5 then we subtract equation II from equation I

Using elimination method we eliminate $C_1$

Then we get $C_2=-\frac{5}{2}$

Substitute the value of $C_2$ in I equation then we get

$C_1-\frac{5}{2}=-7$

$C_1=-7+\frac{5}{2}=\frac{-14+5}{2}=-\frac{9}{2}$

Hence, the general solution is

b. $y(t)=-\frac{9}{2}e^{7t}-\frac{5}{2}e^{-5t}$

7 0

3 years ago

Need the answer please

Leona [35]

Needed points sorry hdjdjdjdjdjd

8 0

2 years ago

Read 2 more answers

Wo mechanics worked on a car. the first mechanic worked for 10 hours, and the second mechanic worked for 15 hours. together they

anyanavicka [17]

------------------------------------------------------------------------------------------------------
Find the cost of the first 10 hours:
------------------------------------------------------------------------------------------------------
10 hours = $220 x 10
10 hours = $2200

------------------------------------------------------------------------------------------------------
Find the cost of the next 5 hours (only the second mechanic worked):
------------------------------------------------------------------------------------------------------
5 hours = $2725 - $2200
5 hours = $525

------------------------------------------------------------------------------------------------------
Hourly charge of the second mechanic:
------------------------------------------------------------------------------------------------------
5 hours = $525
1 hour = $525 ÷ 5
1 hour = $105

------------------------------------------------------------------------------------------------------
Hourly charge of the first mechanic:
------------------------------------------------------------------------------------------------------
$220 - $105 = $115

------------------------------------------------------------------------------------------------------
Answer: First mechanic = $115/hour ; Second mechanic = $105/hour
------------------------------------------------------------------------------------------------------

4 0

2 years ago