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4 years ago

Someone help this gurlllll plzzzzzzzzzz!

Mathematics

1 answer:

kondaur [170]4 years ago

7 0

Hi,

Answer 3 (C).

Using Thalès,

PA/PR=LE/LT

==>5/15=LE/9

==>LE=9/3=3

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4 bells toll together at 9 am. They toll after 7, 8. 11 and 12 seconds respectively. How many times will they toll together agai

Svetach [21]

Answer:

5 times

Step-by-step explanation:

What we need to do here is to find the lowest common multiple of 7,8,11 and 12

This is;

1848

Now, let’s calculate the number of seconds in 3 hours

In 1 hour, we have 3600 seconds

In 3 hours, this will be;

3600 * 3 = 10,800 seconds

So, to find the number of times in which all 4 will toll together, we need to know the number of 1848 seconds in 10,800 seconds

Mathematically, that will be;

10,800/1848 = 5.844

Our answer will be 5 times however

This is because the sixth time they would have sounded together would be more than the 3 hours time frame

8 0

3 years ago

Human blood may contain either or both of two antigens, A and B. Blood that contains only the A antigen is called type A, blood

Talja [164]

Answer:

A. 0.50

B. 0.85

C. 0.05

Step-by-step explanation:

A. Based on the initial statistics, 50% of the blood type is blood type O, hence the probability of choosing bold type O at random is 50/100, which is 0.50 to two decimal places.

B. The total number of donors that can donate to Blood type A is 85%, thus, the probability is 85/100, which is 0.85 to two decimal places.

C. The percentage of people that have the type AB blood is 5%, thus the probability of someone having the A antigen and blood type AB is 5/100, which is 0.05 to two decimal places.

6 0

3 years ago

15. 3x – 4y = -1 5x + 2y = 7

never [62]

Answer:

x = 1, y = 1

Step-by-step explanation:

3x - 4y = -1

5x + 2y = 7

If we multiply the whole second equation by 2, we get:

10x + 4y = 14

Adding this to the first equation:

10x + 4y + 3x - 4y = 14 - 1

13x = 13

x = 1

Applying this to the second equation:

5 (1) + 2y = 7

2y = 2

y = 1

8 0

3 years ago

Name the coordinates of the points

arsen [322]

Answer:

D(-3,3)

E(3,-2)

F(-3,-2)

3 0

3 years ago

Read 2 more answers

Assume that the poisson distribution applies and that the mean number of hurricanes in a certain area is 7.2 per year.

SCORPION-xisa [38]

Part A:

The poisson distribution is given by

$P(x;\mu)=e^{-\mu}\cdot \frac{\mu^x}{x!}$

Thus, given that the mean number of hurricanes in a certain area is 7.2 per year.

The probability that, in a year, there will be 6 hurricanes is given by

 $P(6;7.2)=e^{-7.2}\cdot \frac{7.2^6}{6!} \\ \\ =0.000747\times \frac{139314.0695}{720} \\ \\ =0.000747\times193.492 \\ \\ =0.1445$

Part B:

In a 45-year period, the number of years that are expected to have 6 hurricanes is given by 0.1445 x 45 = 6.5 years.

Part C:

The poisson distribution worked here because, the observed value of the number of years that hurricanes occurred in a 45 year period which is 6 is very close to the calculated value which is 6.5

4 0

3 years ago