Ask question

Ask question

All categories

3 years ago

11

Sandy spent half of Her allowance going to the movies. She washed the family car and earn seven dollars. What is your weekly all

owance if she ended up at $12?

1 answer:

Veseljchak [2.6K]3 years ago

4 0

Answer:

I'm pretty sure it's 13.

Step-by-step explanation:

You might be interested in

Simplity (6 1/4) ^ 4

tatuchka [14]

Answer: 81/16

Please mark em as Brainliest

5 0

3 years ago

Place a point where you think

just olya [345]

Root 78 would go Between 8 and 9

5 0

2 years ago

What is the measure of angle Y, in degrees?

Afina-wow [57]

Answer:

The answer would be 116

Step-by-step explanation:

The angles X and Z would be equal at 32 so multiply them by 2 and you would get 64 subtract 64 from 180 and you would get 116

6 0

3 years ago

Read 2 more answers

Find a particular solution to the differential equation y′′+2y′+y=2t2−t+3e−2t. y′′+2y′+y=2t2−t+3e−2t.

Jlenok [28]

$y''+2y'+y=2t^2-t+3e^{-2t}$

The characteristic equation is

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

so the characteristic solution is

$y_c=C_1e^{-t}+C_2te^{-t}$

For the particular solution, we can try looking for a solution of the form

$y_p=at^2+bt+c+de^{-2t}$
$\implies{y_p}'=2at+b-2de^{-2t}$
$\implies{y_p}''=2a+4de^{-2t}$

Substituting into the ODE, we have

$(2a+4de^{-2t})+2(2at+b-2de^{-2t})+(at^2+bt+c+de^{-2t})=2t^2-t+3e^{-2t}$
$at^2+(4a+b)t+(2a+2b+c)+de^{-2t}=2t^2-t+3e^{-2t}$
$\implies\begin{cases}a=2\\4a+b=-1\\2a+2b+c=0\\d=3\end{cases}\implies a=2,b=-9,c=14,d=3$

So the general solution to the ODE is

$y=y_c+y_p$
$y=C_1e^{-t}+C_2te^{-t}+2t^2-9t+14+3e^{-2t}$

4 0

3 years ago

A student has some $1 and $5 bills in his wallet. he has a total of 16 bills that are worth 56

aev [14]

X = $ 1 bills, y = $ 5 bills

x + y = 16......x = 16 - y
x + 5y = 56

16 - y + 5y = 56
16 + 4y = 56
4y = 56 - 16
4y = 40
y = 40/4
y = 10 <== there are 10 five dollar bills

x + y = 16
x + 10 = 16
x = 16 - 10
x = 6 <=== there are 6 one dollar bills

3 0

3 years ago