X^2>1 solve the inequality and give answer in X belongs to​

Answer:

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Class 10

>>Maths

>>Pair of Linear Equations in Two Variables

>>Algebraic Methods of Solving a Pair of Linear Equations

>>A boat goes 15km upstream and 22km down

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A boat goes 15km upstream and 22km down stream in 15 hours. In 14 hours it can go 45 upstream and 55km down stream. The speed of the boat in still water in km/hr is

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Solution

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Correct option is D)

Let speed of boat in still water(in km/hr) =x and speed of stream(in km/hr) =y

Time required by the boat to travel d kilometers upstream is

x−y

d

.

Time required by the boat to travel d kilometers downstream is

x+y

d

.

According to the given condition,

x+y

22

+

x−y

15

=5

And

x+y

55

+

x−y

45

=14

Here only x is to be found so option method cannot be used using substitution method

Let

x+y

1

=u,

x−y

1

=v

22u+15v−5=0

55u+45v−14=0

Then, by cross multiplication

−15×14−(45)×−5

u

=

−5×55−22×(−14)

v

=

22×45−55(15)

1

−210+225

u

=

−275+308

v

=

990−825

1

15

u

=

33

v

=

165

1

u=

11

1

,v=

5

1

x+y=11, x−y=5

Add both the equations.

⇒ 2x=16

⟹x=8

Explanation:

Answer: Infinite

Explanation: I answered infinite because I am referring to the whole universe. Every 2 minutes a new galaxy is being made and therefore even more planets but if your talking about our galaxy ( The Milky Way)

there are 5000 planets

Answer: You cannot know how many planets are there in the whole universe because they are many dwarf planets,big planets,exo planets and remains of planets so we cannot define how many planets are there in space. But as according to scientists there are atleast more than trillion planets which some who may have life and some undiscovered. And very second or so a galxy is made from clouds of hot gases.So, many planets are there in the universe.But if your talking about our galaxy then there are 100 billion planets or more planets.

Explanation:Please mark as brainliest

Answer:

Answer:

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Explanation:

Answer:

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