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3 years ago

Here you go amiragumbs2

Mathematics

1 answer:

Simora [160]3 years ago

5 0

Umm , what is this for? do you need help on anything or? lol

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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

What’s the percentage?

sdas [7]

Answer:

66%

Step-by-step explanation:

66 out of 100 (66/100) of the grid is shaded, which is 66%

7 0

3 years ago

Coach Kirby is forming dodgeball teams from students in her physical education class.

Cloud [144]

Answer:

6x<48

Step-by-step explanation:

ik its this one because theres 48 players and 6 teams both are even numbers so if you did 48÷6x you would get 8 but theres fewer than 48 kids

6 0

2 years ago

Add the numerator and denominator seperatly, then find the quotient <br> -3( - 8) / 5 + 7

Aleonysh [2.5K]

Numerator = -3( - 8) = - 3 - 8 = -11

Denominator = 5 + 7 = 12

So the quotient = -11/12

Answer

- 11/12

4 0

3 years ago

GUYS AGAIN PLEASE HELP 1 MILLION POINTS, get it wrong i report you!!

Evgesh-ka [11]

Answer:

Sweats heavily , I hope the answer is FALSE

Step-by-step explanation:

Is it right. Please mark Brainliest if is.

4 0

3 years ago