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Lunna [17]
3 years ago
15

There are 3 red and 9 blue counters in a box. A counter is chosen and then replaced. If you did this 144 times, how many times w

ould you expect to get a blue?
Mathematics
1 answer:
anygoal [31]3 years ago
3 0
If you do it 144 times that is (3+9)*12
This means that 12 times 3 red and 9 blue counters will be chosen that means that 9 blue counters will be chosen 12 times. 9*12 is 108.
This means blue counters will be chosen 108 times.
This can be checked as 108/3 would give you the number of red counters which is 36 and 108+36 is 144 

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a) True

Step-by-step explanation:

The left side is where the corner or 0 is, so if a line goes up towards the right, the answer would be positive.

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d. x2 – 2x – 4 = 0

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Read 2 more answers
a furniture store is having a sale on sofas and you're going to buy one. the advertisers know that buyers get to the store and t
Semenov [28]

If a advertised sofa is $200 but the more costly sofa is $375, the average cost of such a sofa will be $200 is $243.75.

<h3>Define the term average of the number?</h3>
  • An averaging is a single number calculated as the average of a set of numbers,.
  • Typically calculated as the sum of a numbers divided by the total number of numbers in the set (the arithmetic mean).

You're planning to purchase a sofa from a furniture store that is having a sale on them.

Let x represent the sofa's price.

Advertised sofa's cost = $200

Expensive sofa's cost = $375

The advertisers are aware that when customers arrive at the store, one out of three switch to an expensive sofa that the one shown in the sale advertisement.

Average cost = 375 x 1/4 + 200 x 3/4

E(x) = 375 x 1/4 + 200 x 3/4

E(x) = 93.75 + 150

E(x) = 243.75

Thus, if a advertised sofa is $200 but the more costly sofa is $375, the average cost of such a sofa will be $200 is $243.75.

To know more about the mean average , here

brainly.com/question/20118982

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4 0
1 year ago
Factor the expression below. 9x^2-1 A. (3x - 1)(3x - 1) B. (3x - 1)(3x + 1) C. (x - 1)(9x - 1) D. (x - 1)(9x + 1)​
aliya0001 [1]

Answer:

(3x + 1) • (3x - 1)

Step-by-step explanation:

Step by Step Solution

More Icon

STEP

1

:

Equation at the end of step 1

3{}^{2}x{}^{2} - 1

STEP

2

:

Trying to factor as a Difference of Squares:

2.1 Factoring: 9x{}^{2}-1

Theory : A difference of two perfect squares, A{}^{2} - B{}^{2} can be factored into (A+B) • (A-B)

Proof : (A+B) • (A-B) =

A{}^{2} - AB + BA - B2 =

A{}^{2}- AB + AB - B2 =

A{}^{2} - B2

Note : AB = BA is the commutative property of multiplication.

Note : - AB + AB equals zero and is therefore eliminated from the expression.

Check : 9 is the square of 3

Check : 1 is the square of 1

Check : x{}^{2} is the square of x1

Factorization is : (3x + 1) • (3x - 1)

Final result :

(3x + 1) • (3x - 1)

6 0
2 years ago
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