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Tomtit [17]
3 years ago
10

If y varies inversely as x and x = 9 when y = 45 , find x when y = 9 .

Mathematics
1 answer:
Harman [31]3 years ago
6 0
I believe it's 1.8, but correct me if I'm wrong.
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A chalkboard has a perimeter of 18 ft and is 6 ft long. Find the height of the chalkboard
MakcuM [25]
P = 2H + 2L
L = 6
P = 18
18 = 2H + 2*6
18 = 2H + 12
6 = 2H
H = 3 ft
3 0
3 years ago
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Solve this one step equation<br> -6+y=2
DiKsa [7]

Answer:

your answer would be 8

Step-by-step explanation:

you would need to add the six to the two and divide y by 8

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An object falls freely in a straight line and experiences air resistance proportional to its? speed; this means its acceleration
KiRa [710]

Answer:

t = 1.068 s

Step-by-step explanation:

given,

a(t) =- k v(t)

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distance = 1400 ft

time for deceleration = ?

a(t) =- k v(t)

\dfrac{dv}{dt}= - kv

\dfrac{dv}{v}= - kdt

integrating both side

\int_{800}^{700}\dfrac{dv}{v}= - k\int dt

ln(\dfrac{7}{8})=-kt

t = -\dfrac{1}{k}ln(\dfrac{7}{8})..........(1)

since,

v = v_1e^{-kt}

\dfrac{ds}{dt} = 800e^{-kt}

\int ds= 800\int_0^t e^{-kt}dt

1400= -\dfrac{800}{k}[e^{-kt}-e^0]

from equation 1

k= -\dfrac{8}{14}[\dfrac{7}{8}-1]

k= \dfrac{1}{8}

putting value of k in equation (1)

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5 0
3 years ago
PLEASE HELP!<br> NO LINKS!<br> I only need help on letter d!!
IRINA_888 [86]
$242.46.............
8 0
3 years ago
Solve this question fast....in the attachment​
avanturin [10]

Answer:

z = 4

y = -1

x = 2

Step-by-step explanation:

x - y = 3

Therefore => x = 3 + y

y + 2z =7

Therefore => y= 7 - 2z

We have the equation :

2x + 3y + 4z = 17

2(3 + y) + 3(7 - 2z) + 4z = 17

6 + 2y + 21 - 6z +4z = 17

2(7 -2z) - 2z + 27 = 17

14 - 4z - 2z + 27 = 17

-6z + 41 = 17

-6z = -24

z = 4

4 0
3 years ago
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