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Oksanka [162]
2 years ago
9

Calculate the length of the circumference of a circle with diameter of 7cm (1dp)

Mathematics
1 answer:
AysviL [449]2 years ago
7 0
22.0. diameter times pie to get your answer then round to 1dp
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A box has two balls, one white and one red. We select one ball, put it back in the box, and select a second ball (sampling with
AleksAgata [21]

Answer:

P (T) = 1/4

P ( T | F )    = 1/2  = P(F)

The events are not independent.

Step-by-step explanation:

Let F the event of picking the white ball first

P (F)= 1/2   ( picking the white ball first)

Let T be the event of getting the white ball twice,

P (T) = P( getting white ball) * P( getting white ball)

          =( 1/2)*(1/2)

           = 1/4

Here P(T∩F) = P(T) because the probability of getting the white balls is the same as probability of getting the white ball first  both the times.

P ( T | F ) = P (T∩F)/ P(F)

                = (1/4)/ (1/2)

                  = (1/2)

                    = 1/2  = P(F)

For the events to be independent the conditional probability P ( T | F )  must be equal to P(T).

Hence the events are not independent.

4 0
3 years ago
A scientist running an experiment starts with 100 bacteria cells. These bacteria double their population every 15 hours. Find ho
emmasim [6.3K]

Answer

It will take (t) = 24 hours to reach 300 .

Step by step explanation

It doubles every 15 hours.  initial bacteria = 100

We need to find how long it take for the bacteria cells to increase to 300.

300 = 100(2)^t/15

300/100 = 2^t/15

3 = 2^t/5

Taking "ln" both sides, we get

ln(3) = t/15 ln(2)

t/15 = ln(3)/ln(2)

t/15 = 1.585

t = 1.585 * 15

t = 23.78 hours

t = 24 hours to nearest whole hours.

Thank you.


6 0
3 years ago
What is the value of 3-(-2)
Vanyuwa [196]

Answer:

5

Step-by-step explanation:

3-(-2)=5

6 0
3 years ago
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Layla spent 25 minutes on
yKpoI14uk [10]

Answer:

D

Step-by-step explanation:

25+30= time Layla spent. 3x time layla spent = elijah's time

4 0
3 years ago
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? What is the basic unit of weight in the metric system of measurement?
Marina86 [1]

Answer:

A. Gram

Step-by-step explanation:

Hope this helps :D brainliest pleaseeee

3 0
2 years ago
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