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alukav5142 [94]
2 years ago
8

Andrew washed 32 car windows in 4 hours. At this rate, how many windows did he wash in 8 hours?

Mathematics
2 answers:
Alexus [3.1K]2 years ago
8 0

8 hours is twice as many as 4:

Multiply the number of windows in 4 hours by 2:

32 x 2 = 64 windows in 8 hours

VikaD [51]2 years ago
6 0

Answer:

64

Step-by-step explanation:

32÷4=8 8 car windows per hour. 8×8=64

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If p varies jointly as q and r, and p = 150 when q = 18 and r = 5, find q when p = 345 and r = 9. TA​
hichkok12 [17]

Answer:

the answer is saltiness, why?

Step-by-step explanation:

because when i was little my bro used to ask me to go up and down with my mouth on his cucumber and i hated it but he offered me candy. Anyway now he gives me 5$ so ill do it more and as many times :D so i can get a new robucks card

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3 years ago
​−x+4y=4<br> ​−x+3y=1<br> Is (8,3) a solution of the system <br> A. Yes<br> B. No
valkas [14]
It has to be yes........
5 0
3 years ago
Solve the given initial-value problem. x^2y'' + xy' + y = 0, y(1) = 1, y'(1) = 8
Kitty [74]
Substitute z=\ln x, so that

\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\mathrm dy}{\mathrm dz}\cdot\dfrac{\mathrm dz}{\mathrm dx}=\dfrac1x\dfrac{\mathrm dy}{\mathrm dz}

\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm d}{\mathrm dx}\left[\dfrac1x\dfrac{\mathrm dy}{\mathrm dz}\right]=-\dfrac1{x^2}\dfrac{\mathrm dy}{\mathrm dz}+\dfrac1x\left(\dfrac1x\dfrac{\mathrm d^2y}{\mathrm dz^2}\right)=\dfrac1{x^2}\left(\dfrac{\mathrm d^2y}{\mathrm dz^2}-\dfrac{\mathrm dy}{\mathrm dz}\right)

Then the ODE becomes


x^2\dfrac{\mathrm d^2y}{\mathrm dx^2}+x\dfrac{\mathrm dy}{\mathrm dx}+y=0\implies\left(\dfrac{\mathrm d^2y}{\mathrm dz^2}-\dfrac{\mathrm dy}{\mathrm dz}\right)+\dfrac{\mathrm dy}{\mathrm dz}+y=0
\implies\dfrac{\mathrm d^2y}{\mathrm dz^2}+y=0

which has the characteristic equation r^2+1=0 with roots at r=\pm i. This means the characteristic solution for y(z) is

y_C(z)=C_1\cos z+C_2\sin z

and in terms of y(x), this is

y_C(x)=C_1\cos(\ln x)+C_2\sin(\ln x)

From the given initial conditions, we find

y(1)=1\implies 1=C_1\cos0+C_2\sin0\implies C_1=1
y'(1)=8\implies 8=-C_1\dfrac{\sin0}1+C_2\dfrac{\cos0}1\implies C_2=8

so the particular solution to the IVP is

y(x)=\cos(\ln x)+8\sin(\ln x)
4 0
3 years ago
Solve the equation. 2t +8= -10 solve for t<br>​
Vesnalui [34]

Answer:

t= -9

Step-by-step explanation:

5 0
3 years ago
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Arisa [49]

Answer:

87

Step-by-step explanation:

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total (T) = $287

time (t) = 40 hr

tips = T - Rt

= $287 - $5*40

$87

3 0
2 years ago
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