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2 years ago

PLEASE SOVEL THIS I WILL GIVE OUT 20 POINT

Mathematics

1 answer:

Anettt [7]2 years ago

5 0

9514 1404 393

Answer:

21.25 seconds

Step-by-step explanation:

In miles per second, the speed of the jet is ...

(720 mi/h)/(3600 s/h) = 1/5 mi/s

The speed of the sound is the same:

(1 mi)/(5 s) = 1/5 mi/s

Then the rate of closure between the airplane and the sound is ...

(1/5 mi/s) +(1/5 mi/s) = 2/5 mi/s

To find the time required to close a gap of 8 1/2 miles, we can use the relation ...

time = distance/speed

time = (8.5 mi)/(0.4 mi/s) = 21.25 s

The pilot will hear the thunder 21.25 seconds after the flash.

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salantis [7]

Let

x--------> the number of blue beads

y--------> the number of red beads

we know that

$x+y=49$

$x=49-y$ -------> equation $1$

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equate equation $1$ and equation $2$

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find the value of x

$x=6*7\\ x=42$

therefore

the answer is

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