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3 years ago

So what is 2+3+5+2+1+8

Mathematics

2 answers:

nlexa [21]3 years ago

4 0

Answer:

21!

Step-by-step explanation:

hoa [83]3 years ago

3 0

Answer:

Step-by-step explanation:

pls mark me as brainliest

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4(-8x + 5) = -32x - 26 A: no solution B: 54 C: all real numbers D: -54

Lelu [443]

Answer:

A) no solutions

Step-by-step explanation:

4(-8x + 5) = -32x - 26

-32x + 20 = -32x - 26

0x + 20 = -26

20 does not equal -26, regardless of what x is.

A) no solutions

Goodluck on your schoolwork/homework!

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sorry for any errors or bad explanations.

7 0

3 years ago

Read 2 more answers

a) Set up the variables: Let ______represent the first number, Then ______will represent the second, Then ______will represent t

eimsori [14]

Answer:

33, 34 and 35

Step-by-step explanation:

Three consecutive numbers have a sum of 102. What are the three integers?

Let x be the first number, then x + 1 is the second, then x + 2 is the third number.

The required equation to show the sum is:

x + x + 1 + x + 2 = 102

Solve for x:

3x + 3 = 102
3x = 99
x = 33

The numbers are 33, 34 and 35

3 0

3 years ago

Solve the given DE dx/dt=3x+2y+1 dy/dt=-2x-y+1

kirill115 [55]

We can solve for $x(t)$ first by rewriting the system of first-order ODEs as a single second-order ODE in $x(t)$ :

Taking the derivative of the first ODE gives

$\dfrac{\mathrm dx}{\mathrm dt}=3x+2y+1\implies\dfrac{\mathrm d^2x}{\mathrm dt^2}=3\dfrac{\mathrm dx}{\mathrm dt}+2\dfrac{\mathrm dy}{\mathrm dt}$

while solving for $2y$ gives

$\dfrac{\mathrm dx}{\mathrm dt}=3x+2y+1\implies2y=\dfrac{\mathrm dx}{\mathrm dt}-3x-1$

Then

$\dfrac{\mathrm d^2x}{\mathrm dt^2}=3\dfrac{\mathrm dx}{\mathrm dt}+2(-2x-y+1)$

$\dfrac{\mathrm d^2x}{\mathrm dt^2}=3\dfrac{\mathrm dx}{\mathrm dt}-4x-2y+2$

$\dfrac{\mathrm d^2x}{\mathrm dt^2}=3\dfrac{\mathrm dx}{\mathrm dt}-4x-\left(\dfrac{\mathrm dx}{\mathrm dt}-3x-1\right)+2$

$\implies\dfrac{\mathrm d^2x}{\mathrm dt^2}-2\dfrac{\mathrm dx}{\mathrm dt}+x=3$

which is linear with constant coefficients, so it's trivial to solve; the corresponding homogeneous ODE

$x''-2x'+x=0$

has characteristic equation

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

with root $r=1$ (multiplicity 2), so the characteristic solution is

$x_c=C_1e^t+C_2te^t$

For the non-homogeneous ODE, assume a particular solution of the form

$x_p=a\implies{x_p}'={x_p}''=0$

Substituting these into the ODE gives

$0-2\cdot0+a=3\implies a=3$

Then the general solution for $x(t)$ is

$\boxed{x(t)=C_1e^t+C_2te^t+3}$

From here, we find

$\dfrac{\mathrm dx}{\mathrm dt}=C_1e^t+C_2(t+1)e^t$

so that

$2y=(C_1e^t+C_2(t+1)e^t)-3(C_1e^t+C_2te^t+3)-1$

$\implies\boxed{y(t)=\left(\dfrac{C_2}2-C_1\right)e^t-C_2te^t-5}$

3 0

4 years ago

Evaluate ( a + 1 ) 2 – 5 when a = – 3

nadya68 [22]

Answer:

-9

Step-by-step explanation:

Let, a = -3

(a + 1) 2 – 5

(-3 + 1) 2 - 5

-2 * 2 - 5

-4 - 5

-9

Hope it helps ⚜

7 0

2 years ago

I have 1 hundreds, 4 ones, 2 tens, and 1 tenths. What number am I?

DaniilM [7]

Since it reads 1 hundreds, that means 100. 4 ones mean 4 * 1, which is 4. 2 tens means 2 * 10, which is 20. Add those together and you get 124. Where it reads "1 tenth", that means 0.1
Therefore, the number is 124.1

6 0

4 years ago