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sladkih [1.3K]
4 years ago
6

What is 440 = -7(8n + 1)-1

Mathematics
1 answer:
Vlada [557]4 years ago
3 0

Answer: n= -8

Step-by-step explanation:

440= -7(8n+1)-1

440= -56n-7-1

440= -56n-8

56n= -8-440

56n= -448

n= -8

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Time = 6hours

Distance = 38.4 Km

Speed = distance /time
 
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3 years ago
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What is the difference in speed between two cars when one traveled 175 km in 4 hours and the other traveled the same distance in
vovangra [49]
<h3>Given :</h3>
  • Distance = 175
  • Time 1 = 4 hours

\\  \\

<h3>To find:</h3>
  • Different between two speeds when distance is same.

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<h3>Solution:</h3>

<u>Part</u><u> </u><u>1</u><u> </u><u>:</u>

In first part we will find speed 1 in which time is 4 hours

we know:-

\bigstar \boxed{ \rm speed =  \frac{distance}{time} }

So:-

\dashrightarrow\sf speed_1 =  \dfrac{distance}{time_1}

\\  \\

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\dashrightarrow\bf speed_1 =  43.75 \: km {h}^{ - 1}

<u>Part 2</u>

In first part we will find speed 2 in which time is 3 hours

Again:

\bigstar \boxed{ \rm speed =  \frac{distance}{time} }

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\dashrightarrow\sf speed_2 =  \dfrac{distance}{time_2}

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\dashrightarrow\sf speed_2 =  \dfrac{175}{3}

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\dashrightarrow\bf speed_2 = 58.33kmh^{-1}

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<u>Part 3</u>

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\bigstar  \boxed{\rm Difference = speed_2 - speed_1}

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\therefore \underline {\textsf{\textbf{Difference in speed between two cars is \red{14.58km/h}}}}

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