1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
victus00 [196]
2 years ago
13

en un maratòn participan corredores de todos los continentes 5/6 de los corredores son europeos se sabe que los americanos son l

a dècime parte de los europeos y que los africanos son la quinta parte de los americanos el resto de los participantes son mitad asiaticos y mitad de Oceanìa
Mathematics
1 answer:
Marysya12 [62]2 years ago
8 0

Usando proporciones, se encuentra que 400 africanos han participado.

En total, hay x participantes.

\frac{5}{6} de los corredores son europeos, o sea:

E = \frac{5x}{6}

Los americanos son la dècime parte de los europeos, o sea:

Am = \frac{1}{10}E = \frac{5x}{60} = \frac{x}{12}

Los africanos son la quinta parte de los americanos, o sea:

Afr = \frac{1}{5}Am = \frac{x}{60}

En la carrera han inscritos 24 000 participantes, o sea, x = 24000. Por eso, la cantidad de africanos es:

Afr = \frac{x}{60} = \frac{24000}{60} = 400

Para obtener más información sobre las proporciones, puedes visitar a brainly.com/question/24615636

You might be interested in
Write the equation in slope-intercept form. 5x+3y=12
Umnica [9.8K]
5x+3y=12
Subtract 5x from both sides
3y=-5x+12
Divide by 3
Y=-5/3x +4
7 0
2 years ago
The altitude of a triangle is increasing at a rate of 1 cm/ min while the area of the triangle is increasing at a rate of 2 cm2
serg [7]
Ya, calculus and related rates, such fun!




everything is changing with respect to t

altitude rate will be dh/dt and that is 1cm/min
dh/dt=1cm/min

area will be da/dt which is increasing at 2cm²/min
da/dt=2cm²/min

base=db/dt

alright

area=1/2bh
take dervitivie of both sides
da/dt=1/2((db/dt)(h)+(dh/dt)(b))
solve for db/dt
distribute
da/dt=1/2(db/dt)(h)+1/2(dh/dt)(b)
move
da/dt-1/2(dh/dt)(b)=1/2(db/dt)(h)
times 2 both sides
2da/dt-(dh/dt)(b)=(db/dt)(h)
divide by h
(2da/dt-(dh/dt)(b))/h=db/dt

ok
we know
height=10
area=100
so
a=1/2bh
100=1/2b10
100=5b
20=b

so
h=10
b=20
da/dt=2cm²/min
dh/dt=1cm/min

therefor
(2(2cm²/min)-(1cm/min)(20cm))/10cm=db/dt
(4cm²/min-20cm²/min)/10cm=db/dt
(-16cm²/min)/10cm=db/dt
-1.6cm/min=db/dt

the base is decreasing at 1.6cm/min
4 0
3 years ago
What is 3(5x^2-9x) evaluated for x=-3
Studentka2010 [4]

Answer:

216

Step-by-step explanation:

put -3 where x is

3 ( 5 -3^2 - 9(-3) )

3 ( 45 + 27 )

3 (72)

216

4 0
2 years ago
Read 2 more answers
A manatee surfaced for air 6 times in 240 seconds. How many seconds went by before the manatee surfaced the fourth time if it he
Norma-Jean [14]
I think it is 160 seconds
3 0
2 years ago
5. What is the total surface area of the figure below?<br>6 cm<br>7 cm<br>13.1 cm​
zhannawk [14.2K]

Answer:

550.2cm

Step-by-step explanation:

6 cm x 7 cm x 13.1 cm = 550.2 cm

8 0
3 years ago
Other questions:
  • a bakery can make 175 pasteries a day. the bakery has been sold out for 3 days in a row. Determine if an estimate or exact amoun
    8·2 answers
  • Find the dimensions of the rectangle with perimeter 64 inches that has maximum area, and then find the maximum area.
    5·1 answer
  • Tell me the answer to the question plz​
    8·1 answer
  • Suppose Mike has a dresser with 3 tan pants, 5 jeans, 2 black pants, and 3 gray pants. He also has 2 brown shoes, 3 black shoes,
    9·1 answer
  • The sum of two numbers is 53 and the difference is 5. what are the numbers
    11·1 answer
  • Which is the area of the rectangle?<br> 69<br> 115<br> 100
    10·1 answer
  • Please help stress at hone leaving effect on work
    10·2 answers
  • Can anyone please tell the answer of the 2 questions!!!! please!!!! ​
    5·2 answers
  • Kevin has $24 to buy a gift for his cousin. He found a gift for $22. With 5% sales tax added on, will Kevin have enough money to
    10·1 answer
  • Which of the following is equal to tan θ using coordinates on the unit circle? Question 18 options: A) x∕y B) y C) y∕x D) x
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!