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3 years ago

X - 2/5= 7 find out what x is

Mathematics

2 answers:

nalin [4]3 years ago

8 0

Answer:

see below

Step-by-step explanation:

x - 2/5= 7

Add 2/5 to each side

x - 2/5 + 2/5 = 7+2/5

x = 7 2/5

or if

( x-2) /5 = 7

Multiply each side by 5

(x-2) /5 *5 = 7*5

x-2 = 35

Add 2 to each side

x-2+2 = 35+2

x = 37

aleksandr82 [10.1K]3 years ago

7 0

Answer:

Step-by-step explanation:

x - 2/5= 7

find out what x is

x - 2/5 = 7

x - 2 = 7 (5)

x - 2 = 35

x = 35 + 2

x = 37

--------

x - 2/5 = 7

x = 7 + 2/5

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A wind turbine is located at the top of a hill where the wind blows steadily at 12 m/s, and stands 37 m tall. The air then exits

marta [7]

Answer:

Power generated = 4.315 kW

Step-by-step explanation:

Given,

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speed of wind when exits from the turbine, U = 9 m/s

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According to the law of conservation of energy

Energy generated = change in kinetic energy

Since, the air is exiting at same elevation. So, we will consider only kinetic energy.

Energy generated in one second will be given by,

$E\ =\ \dfrac{1}{2}.mV^2-\dfrac{1}{2}.m.U^2$

$=\ \dfrac{1}{2}\times 137\times (12)^2-\dfrac{1}{2}\times 137\times (9)^2$

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So, energy is generated in one second = 4.315 kJ

Power generated can be given by,

$P\ =\ \dfrac{\textrm{energy generated}}{time}$

And the energy is generated is already in per second so power generated will be 4.315 kW.

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3 years ago

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madam [21]

Answer
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Explanation
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