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3 years ago

Anyone can you help me?

Mathematics

2 answers:

RoseWind [281]3 years ago

8 0

$s=vt$

s = the distance traveled

v = the velocity of sound

t = the time taken

Lightning and thunder are produced simultaneously, but the thunder is heard a few seconds after the lightning is seen. This is because the speed of light in air is more than the speed of sound in air.

The speed of sound is 340 m/s. Thus, the entire time of 10 seconds (as mentioned in the question) between seeing the light and hearing the thunderstorm is taken by the sound to travel to the observer. Hence, the distance traveled by the thunder is given as follows.

$330m/s×10s=3400m=3.4km.$

Thus, the distance traveled by the thunder is 3.4km.

-BARSIC- [3]3 years ago

6 0

$\huge\color{aqua}{ \colorbox{aqua}{\colorbox{white} {Answer:}}}$

The distance traveled by the thunder is 34.4km.

$\huge\color{lime}{ \colorbox{lime}{\colorbox{white} {ChaEunWoo2009}}}$

#CarryOnLearning

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Find the missing endpoint if S is the midpoint RT

Stolb23 [73]

Answer:

10. T(-20, 9)

11. R(-1, -9)

12. D(-6, 5)

Step-by-step explanation:

The relationship between end points and the midpoint can be solved generically for one of the end points. That relation can be used for the different points in these problems.

<h3>generic solution</h3>

The coordinates of midpoint M is related to the coordinates of end points A and B by ...

M = (A +B)/2

This can be solved for end point B, given end point A and midpoint M:

2M = A +B

2M -A = B

Then the generic equation for end point B given end point A and midpoint M is ...

B = 2M -A

In each of the numbered problems, the midpoint and one end point are given. These can be matched with the variables in the above formula, so the solution is simply a matter of arithmetic. Beware all the minus signs.

T = 2R -S

T = 2(-9, 4) -(2, -1) = (2(-9) -2, 2(4) +1)

T = (-20, 9)

R = 2S -T

R = 2(-4, -6) -(-7, -3) = (2(-4) +7, 2(-6) +3)

R = (-1, -9)

B = (A +C)/2 = ((-9, -4) +(-1, 6))/2 = (-9 -1, -4 +6)/2 = (-10, 2)/2

B = (-5, 1) . . . . the missing midpoint of AC

D = 2B -E . . . . the missing end point of BD

D = 2(-5, 1) -(-4, -3) = (2(-5) +4, 2(1) +3)) = (-10 +4, 2 +3)

D = (-6, 5)

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3 years ago

At a used book sale, 5 books cost $15. What is the cost per book?

Arte-miy333 [17]

Answer:

$3/book

Step-by-step explanation:

cost per book means divide the price of all the books by the number of books

$15/(5 books) = $3/book

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3 years ago

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IRISSAK [1]

The sum of the first $n$ terms of a geometric sequence is given by:

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Yakvenalex [24]

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