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Ugo [173]
3 years ago
6

Someone help me please?

Mathematics
1 answer:
gavmur [86]3 years ago
7 0
The answer would be Acute angles
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I promise I will mark as brainiest if a speed of a car increase its average speed in a journey of 200 miles by 5 mile/hour the j
jok3333 [9.3K]

Answer:

\large \boxed{\sf \ \ \ \dfrac{\sqrt{4025}-5}{2}=29.22144... \ \ \ }

Step-by-step explanation:

Hello

<u>Let's note the original speed of the car v</u>

it means that in 1 hour he is going v miles

so to go 200 miles it takes ( in hour)

\dfrac{200}{v}

If the speed of the car is v+5 than to go 200 miles it takes (in hour)

\dfrac{200}{v+5}

and this time is one hour less so we can write

\boxed{\sf \ \ \dfrac{200}{v+5}=\dfrac{200}{v}-1 \ \ }

We can multiply by v(v+5) both parts of the equation so

200v=200(v+5)-v(v+5)\\\\200v=200v+1000-v^2-5v\\\\v^2+5v-1000=0

\Delta=b^2-4ac=5^2+4*1000=4025\\\\ \text{There are potential solutions }\\\\\ \ \ \ \ x_1=\dfrac{-5-\sqrt{4025}}{2}\\\\\ \ \ \ \ x_2=\dfrac{-5+\sqrt{4025}}{2}

Only one is positive and this is is

x_1=\dfrac{\sqrt{4025}-5}{2}=29.22144...

So the original speed is 29.22144... mph

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

7 0
3 years ago
Someone pls tell me the answer to this5(6.2+z);z=3.8
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Answer:

30.2 is the answer (use distrubutyion in this problem)

Step-by-step explanation:

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Work out the value of Z+XxY<br>.<br>.<br>.<br>HLEP PLS ​
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Answer:

person is trying to scam named  lotst of them trying to get peoole in this siste caklled cuttly something avoid it please post everywere report do anything u can

Step-by-step explanation:

DON"T DO IT ITS A SCAMER THEY CHANGE THERE NAME EVERYTIME SHOWS BAD THING AND CAN ACSEES UR LOCATION NAD ACCOUNT

cheseedra2020 avatar

POST EVERYWERE STY SAFE!!!

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What is the answer to this
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Answer:

Bruh Moment

Step-by-step explanation:

B R U H M O M E N T

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3 years ago
GIVING BRAINLIEST!! PLZ HELP ME I HAVE TO FINISH BY SIX O CLOCK!!
JulsSmile [24]
1/2 = 18 cut
Cut= 1/36
So if victor rides for time t+ 1/36
Alex rides for t
D= 18 (t + 1/36) = 24 t
18 t+ 18/36 = 24 t
6 t = 1/2
T = 1/12 hour = 5 minutes
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