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3 years ago

A family has 5 children. Compute the probabilities of the following events:

Mathematics

2 answers:

Bezzdna [24]3 years ago

7 0

Answer:

1/16,807 chance that they all will be born on Friday

Probably 5/7, but don't take my word for it.

Step-by-step explanation:

There are 7 days of the week.

There is a 1/7 chance for one kid to be born on a certain day of the week.

We can attach an exponent of 5 since the 1/7 is a constant, and I'm not going to bother typing the same thing over and over again.

(1/7)^5 = 1/16,807.

The probability of all of them being born on Friday or anyday is 1/16,807.

The probability of each person being born on a different day of the week is probabily going to be 5/7, but it could be different, because you need to factor in the requirement that they are not born on the same day.

I can guarantee that the first question is probably correct, but not the second.

Arlecino [84]3 years ago

4 0

I think the answer is 10% and 90%

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Trapezoid JKLM is is shown below. What is the length in centimeters, of KL

IrinaVladis [17]

The complete question is:

Trapezoid JKLM is shown below.

What is the length, in centimeters, of KL ?

A. 12 cm

B. 10 cm

C. 9 cm

D. 6 cm

The mentioned figure is attached.

Answer:

$\large\boxed{option\text{ B. }(\overline{KL})=10cm}$

Explanation:

1. KL is the hypotenuse of a right triangle; hence, you can use Pythagora's theorem to find its length.

2. The height 8 cm is one leg of the right triangle.

3. The other leg may be found by difference:

$\overline{ML} -\overline{JK}=15cm-9cm=6cm$

4. Now you can use Pythagora's theorem:

$hypotenuse^2=(leg_1)^2+(leg_2)^2\\ \\ (\overline{KL})^2=(8cm)^2+(6cm)^2\\ \\ (\overline{KL})^2=64cm^2+36cm^2=100cm^2\\ \\ (\overline{KL})=10cm$

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4 years ago

Plz help asap will give 5 stars

saveliy_v [14]

We need to find the hypotenuse of the triangle. We can find that by using the Pythagorean theorem: a² + b² = c²

Solve with the given values of the triangle:

2² + 4² = c²

4 + 16 = c²

20 = c²

√20 = √c²

4.47 ≈ c

Find the area of the square using: A = bh

4.47 * 4.47 = 19.9809

Therefore, the area of the square is approximately 19.9809units²

Best of Luck!

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Can someone plz help me with this one?

Gennadij [26K]

Hey!!
4x²-0x-9
=(2x)²-(3)²
=(2x-3)(2x+3)
so option B

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nadya68 [22]

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