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Irina18 [472]
4 years ago
8

You draw a card at random from a deck that contains 3 black cards and 7 red cards. What is the probability of drawing a black ca

rd
Mathematics
1 answer:
g100num [7]4 years ago
7 0

Answer:

Probability of drawing a black card =  \frac{3}{10} or 0.3 .

Step-by-step explanation:

Given : You draw a card at random from a deck that contains 3 black cards and 7 red cards.

To find : What is the probability of drawing a black card.

Solution : We have given that

Deck that contains  black cards  = 3.

Red cards = 7.

Total card = 10.

Probability of drawing a black card = \frac{3}{10}.

Probability of drawing a black card = 0.3.

Therefore,  Probability of drawing a black card =  \frac{3}{10} or 0.3 .

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Pls answer this with an explanation if you can
Nuetrik [128]

Answer:

The answer is D

Step-by-step explanation:

$13.95 divided by 100 = 1% which is equal to $0.1395

To get 15% of her bill, you need to multiply $0.1395 by 15 which gives you $2.0925. You then round this to 2 significant figures, which totals to $2.10.

3 0
3 years ago
Factor the expression 3x^(2)+10x+8
marin [14]

Hello,

If we want to factor the expression, we have to solve

3x² + 10x + 8 = 0

a = 3 ; b = 10 ; c = 8

∆ = b² - 4ac = 10² - 4 × 3 × 8 = 4 > 0

x1 = (-b - √∆)/2a = (-10 - 2)/6 = -12/6 = -2

x2 = (-b + √∆)/2a = (-10 + 2)/6 = -8/6 = -4/3

Factor :

a (x - x1)(x - x2)

= 3(x + 2)(x + 4/3)

= (x + 2)(3x + 4)

8 0
2 years ago
Write an expression that represents the area of a circle with radius 3x^3. (For any circle with radius r, a=π r^2 = π .r .r ^.)
aalyn [17]

9514 1404 393

Answer:

  B. 9πx^6

Step-by-step explanation:

Putting the given radius into the area formula gives ...

  A = πr^2

  A = π(3x^3)^2 = π(3^2)(x^(3·2))

  A = 9πx^6

6 0
3 years ago
Problem 6
Leno4ka [110]

Answer:

8 rabbits

22 chickens

Step-by-step explanation:

c = chickens

r = rabbits

heads - c + r = 30

legs - 2c + 4r = 76

We can now use these two equations to create one by isolating the variable (c) in the first equation.

c = 30 - r

2c + 4r = 76

2(30 - r) + 4r = 76

60 - 2r + 4r = 76

2r = 16

r = 8

Now we know that there are 8 rabbits, which means that there has to be 22 chickens in order to have 30 heads.

3 0
3 years ago
(a + 3)(a - 2)<br><br><br> hurry helpppp asapppp
mote1985 [20]

(a+3)(a-2)

Multiply the two brackets together

a^2-2a+3a+3*-2

a^2+a-6

Answer is a^2+a-6

7 0
3 years ago
Read 2 more answers
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