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jenyasd209 [6]
3 years ago
14

5x + 2y = 17 and 3x - 2y = 7 *

Mathematics
2 answers:
Inessa [10]3 years ago
8 0
5x + 3x =8x and 2y- 2y =0 so the answer is 8x I guess I’m sorry idk
Lapatulllka [165]3 years ago
4 0

Answer:

(3,1)

Step-by-step explanation:

5x + 2y = 17

3x - 2y = 7

Add the two equations to eliminate y

5x + 2y = 17

3x - 2y = 7

---------------------

8x   = 24

Divide each side by 8

8x/8 = 24/8

x =3

Now we need to find y

5x+2y = 17

5(3) +2y =17

15+2y =17

Subtract 15 from each side

15-15+2y =17-15

2y =2

Divide each side yby2

2y/2 =2/2

y=1

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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:

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

<em>You have to wait 1.75 seconds to hear the sound of the bat hitting the ball</em>

Step-by-step explanation:

<u>Speed of Sound</u>

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}

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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}

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

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           ————

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