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3 years ago

Four less than the square of a number is 0

Mathematics

2 answers:

marusya05 [52]3 years ago

5 0

Answer:

± 2

Step-by-step explanation:

let the number be n , then

n² - 4 = 0 ( add 4 to both sides )

n² = 4 ( take square root of both sides )

n = ± $\sqrt{4}$ = ± 2

The number is - 2 or 2

Montano1993 [528]3 years ago

5 0

Answer:

If ∈ℝ, prove that 0<<1 ⟹ 0<2< and >1⟹2>.

I found some solution for rational 's but I'm stuck with real 's.

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If you are 600 m from a batter when you see him hit a ball, how long will you wait to hear the sound of the bat hitting the ball

Molodets [167]

Answer:

The speed of sound at 20°C is 343.42 m/s.

You have to wait 1.75 seconds to hear the sound of the bat hitting the ball

Step-by-step explanation:

Speed of Sound

The speed of sound is not constant with temperature. Generally speaking, the greater the temperature, the greater the speed of sound.

The approximate speed of sound in dry air at temperatures T near 0°C is calculated from:

$\displaystyle v_{\mathrm {s} }=(331.3+0.606\cdot T )~~~\mathrm {m/s}$

The air is at T=20°C, thus the speed of sound is:

$\displaystyle v_{\mathrm {s} }=(331.3+0.606\cdot 20 )~~~\mathrm {m/s}$

$v_{\mathrm {s} }=343.42\ m/s$

The speed of sound at 20°C is 343.42 m/s.

To calculate the time to hear the sound after the batter hits the ball, we use the formula of constant speed motion:

$\displaystyle v=\frac{d}{t}$

Where d is the distance and t is the time. Solving for t:

$\displaystyle t=\frac{d}{v}$

Substituting the values v=343.42 m/s and d=600 m:

$\displaystyle t=\frac{600}{343.42}$

t = 1.75 s

You have to wait 1.75 seconds to hear the sound of the bat hitting the ball

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3 years ago

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sergey [27]

Answer:

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Step-by-step explanation:

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2 years ago

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devlian [24]

Answer: A vertical line from (-5 , 4 ) to (5 , 4)

Step-by-step explanation: The y axis is the vertical one. Go up 4 and draw a line connecting all the points with 4 in the coordinates.

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sattari [20]

The answer would be A. 344000 and H=6 :)

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3 years ago

A store can buy 3 pairs of shorts for $10 . How much would the store pay for a dozen

FromTheMoon [43]

Answer:

$40

Step-by-step explanation:

12 ÷ 3 = 4

4 × 10 = 40

So, the answer is $40.

<h2>Please mark as Brainliest!!!</h2>

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3 years ago

Four less than the square of a number is 0​

Four less than the square of a number is 0