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2 answers:
Answer:
2886.34 mm
Step-by-step explanation:
The radius of the disc is given to be 35 millimeters. This means that the distance from the edge of the large circle to the center is 35 millimeters.
We need to find the large circle area and subtract the small circle area from it.
Large circle area:
Area = π
= π
= 1225π
The radius of the small circle is half the radius of the large circle. 35/2 = 17.5
Small circle area:
Area = π
= π
= 306.25π
Large circle - small circle =
1225π - 306.25π = 918.75π
= 2886.3<u>4</u> mm
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Answer:
The world population at the beginning of 2019 will be of 7.45 billion people.
Step-by-step explanation:
The world population can be modeled by the following equation.
In which Q(t) is the population in t years after 1980, in billions, Q(0) is the initial population and r is the growth rate.
The world population at the beginning of 1980 was 4.5 billion. Assuming that the population continued to grow at the rate of approximately 1.3%/year.
This means that
So
What will the world population be at the beginning of 2019 ?
2019 - 1980 = 39. So this is Q(39).
The world population at the beginning of 2019 will be of 7.45 billion people.