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3 years ago

7x-4y=20 for y when x=3

Mathematics

2 answers:

viktelen [127]3 years ago

6 0

I think it is y=-.25
7*3 - 4y = 20
21 - 4y = 20
subtract 21 from each side
- 4y = - 1
divide each side by - 4
y= -.25

Snowcat [4.5K]3 years ago

5 0

the answer to 7x-4y=20 for y when x=3 is y = 25 i think

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Mandarinka [93]

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3 years ago

Solve the proportion ? : 32 = 9 : 4 for the unknown. a72 b48 c36 d18

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Step-by-step explanation:

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3 years ago

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Sergio [31]

Answer:

x = -7/5

Step-by-step explanation:

If we square both sides of the equation, we get:

$\sqrt{x^2-3x-6}=x-1\\ (\sqrt{x^2-3x-6})^2=(x-1)^2\\x^2-3x-6=x^2-2x+1\\$

Then, solving for x, we get:

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2 years ago

A clown is shot out of cannon with a velocity of 200 feet per second at an angle of 24°

Nadusha1986 [10]

Answer:

Vertical component of velocity is $81.35 ft/sec.$

Horizontal component of velocity is $182.6 ft/sec$ .

Step-by-step explanation:

Horizontal component of velocity is defined as:

$v_{x} = v\times cos\theta$

Vertical component of velocity is defined as:

$v_{y} = v\times sin\theta$

Where $v_{x} , v_{y}$ are the horizontal and vertical components of velocity.

$v$ is the actual velocity and

$\theta$ is the angle with horizontal axis at which the object was thrown.

Here, we are provided with the following:

$v = 200 ft/sec$

$\theta = 24^\circ$

$v_{x} = 200 \times cos24^\circ\\\Rightarrow 200 \times 0.913\\\Rightarrow v_{x} = 182.6 ft/sec$

$v_{y} = 200 \times sin24^\circ\\\Rightarrow 200 \times 0.407\\\Rightarrow v_{y} = 81.35 ft/sec$

So, Vertical component of velocity is $81.35 ft/sec.$

Horizontal component of velocity is $182.6 ft/sec$ .

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2 years ago