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3 years ago

Help I be trying so but can figure out the answer

Mathematics

2 answers:

Ede4ka [16]3 years ago

8 0

Answer:

Step-by-step explanation:

We are to assume the earth is a sphere and the radius has been given in the question which is 3959 miles

Area of a sphere = 4*pi*r^2

Where pi= 22/7 (constant)

r= radius

Area= 4*22/7*3959^2

=4*22/7*15673681

=1379283928/7

=197040561.14 square mile

=197040561.14 mi^2

Total area of the earth has been solved as 197040561.14 mi^2 and 20 percent of this surface area is suitable to live on.

We calculate the 20% thus:

20/100 * 197040561.14 mi^2

=3940811222.8/100 mi^2

=39408112.228mi^2

There are approximately 7.7 billion people on earth that will live on the suitable land with an area of 39408112.228mi^2

Each person in the world will have square mile of

39408112. 228 mi^2 / 7.7billion persons

=39408112.228/7700000000

=0.0051179367mi^2 per person

Approximately, 0.00512mi^2/person (option C)

Check the attachment for better mathematical expressions

Sphinxa [80]3 years ago

4 0

Answer:

Step-by-step explanation:

Surface of the earth =3959×3.14

=12,437.565

if 20%is suitable so we multiply it by the surface

12,437.565×0.2=2,487.513 per people

2,487.513/7,700,00,00

So I think it will be the closest to b

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Answer:

Step-by-step explanation:

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3 years ago

Question 5 id points

NARA [144]

Probability of winning a grand prize is 1/10

Probability of winning a basic prize is 11/20

What is the probability of two independent events?

If A and B are two independent events, then P(A and B) = P(A) * P(B).

If Events A and B are independent, the probability that either Event A or Event B occurs is: P(A or B) = P(A) + P(B) - P(A and B).

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P(A) = no. of A / total possibility

= 4/10

P(B) = no. of 1's/total possibility

= 3/12

= 1/4

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= 4/10 + 1/4 - 1/10

= 3/10 + 1/4

∴ P(A or B)= 11/20

To learn more about probability of independent events click on the link below:

brainly.com/question/16157262

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