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Ksju [112]
3 years ago
15

Kristina and Darrin are running around a circular track with the same angular speed. Darrin is running on the inside lane which

has radius 40 ft and Kristina is running on the outside lane which has radius 44 ft. If Kristina is running at a rate of 11 ft per second, how fast is Darrin running?
Mathematics
1 answer:
Nataliya [291]3 years ago
7 0

Answer:

10 ft/s

Step-by-step explanation:

If Kristina is running at a rate of 11 ft/s and on a circular track with radius of 44 ft, then her angular speed is:

\omega_K = \frac{v_K}{r_K} = \frac{11}{44} = 0.25 rad/s

And so is Darrin's angular speed. That means his rate is

v_D = \omega_D * r_D = 0.25 * 40 = 10 ft/s

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emmasim [6.3K]

The continent which has 59% of the total population will have more than 5.31 billion people by 2050.

<u>Step-by-step explanation:</u>

It is given that,

  • The total number of people is 9 billion.
  • The estimated number of people in 2050 year is 5.31 billion.

Therefore, you need to find out which continent has the estimated number by finding the percentage value.

<u>To find what percent 5.31 is of billion is of 9 billion :</u>

Let x be the percentage to be calculated.

⇒ x percent of 9 billion is 5.31 billion.

⇒ (x/100) × 9 = 5.31

⇒ x = (5.31 × 100) / 9

⇒ x = 531 / 9

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3 years ago
A simple random sample is free from any systematic tendency to differ from the population from which it was drawn.
Ket [755]

Answer:

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Sampling variation, random samples dont really reflect the population from where i is drawn, but it is close.

4 0
4 years ago
3.Find the area of Triangle and Parallelogram having base 13.5cm and height is 18cm.​
patriot [66]
  • Base=13.5cm
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\\ \sf\longmapsto Area=\dfrac{1}{2}Base\times Height

\\ \sf\longmapsto Area=\dfrac{1}{2}(18)(13.5)

\\ \sf\longmapsto Area=9(13.5)

\\ \sf\longmapsto Area=121.5cm^2

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Anastasy [175]

Answer:

x=55 degrees

Step-by-step explanation:

Angle X + 125 degrees is 180 degrees. 180 minus 125 is 55.

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Help pls ! <br> i’ll mark brainliest to whoever answers it right first.<br> thanks !
Bess [88]
About 90ft

step-by-step explanation: 1/2 (a+b) x h is area of trapezoid. So that would be 40
then area of circle is pi x radius squared. So that is 50.24 roughly.

so 50+40=90

and yeah

hope this helped :))
7 0
3 years ago
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