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Romashka [77]
3 years ago
7

There are 9 students ain class 2 boys 7 girls and a teacher picks 4 at random what is the probability in the group that everyone

is a girl
Mathematics
1 answer:
marissa [1.9K]3 years ago
3 0

Answer:

2/3.

Step-by-step explanation:

Ok, so at first, the probability of the teacher picking a girl is 7/9. And then when she takes one girl, it is less, so the probability is 6/8. Then if she picks 2 more girls, then the probability of that would be 4/6, or 2/3.

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A right cylinder has the radius of 3.5cm and the height of 11cm if i place 3 ice cube with edge length of 2cm in the glass what
Brrunno [24]

Answer:

Volume of cylinder =

\pi  \times r {}^{2}  \times h

\pi \times 3.5 {}^{2}  \times 11 = 423cm {}^{3}

Volume of 1 ice cube = 2*2*2= 8cm3

Volume of 3 ice cubes= 3*8= 24cm3

Volume of juice added = 423-24 = 399 cm3

4 0
3 years ago
I need some help please
Ganezh [65]
SOH CAH TOA tells you
  Cos(x) = Adjacent/Hypotenuse
so you can find
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8 0
3 years ago
The width of a rectangular card is 2 cm lekss than the Tength. The area is 15 cm. Find the length and
Yuri [45]

Answer:

Step-by-step explanation:

Area A = 15square cm

Length L = x

Width w = x - 2

Area = L × w

15 = x(x - 2)

15 = x^2 -2x

x^2 -2x - 15 = 0

Solving by factorization

x^2 - 5x + 3x - 15 = 0

(x^2 -5x) + (3x -15) = 0

x(x - 5) + 3(x - 5) = 0

(x + 3)(x - 5) = 0

(x + 3) = 0 or (x - 5) = 0

x = -3 or 5

Since x can't be negative therefore x is 5cm

Length = 5cm

Width = 5-2 = 3cm

5 0
3 years ago
Two whole numbers A and B satisfy the following conditions. Find A and B.
baherus [9]
Answer: A = 16 and B = 28

Explanation:
16 + 28 = 44
16:28 = 4:7
:)
8 0
2 years ago
What is the Radius of a circle if a 16 unit chord is 6 units from the center of the circle
velikii [3]

Answer:

radius = 10 units

Step-by-step explanation:

using the Pythagorean theorem:

height of triangle = 6 units

base of triangle = 16/2 = 8 units

radius² = 6² + 8² = 36 + 64 = 100

radius = √100 = 10 units

6 0
3 years ago
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