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3 years ago

Three of the choices describe the ratio of blue marbles to red marbles. Which choice does NOT?

Mathematics

1 answer:

ElenaW [278]3 years ago

4 0

9:12 does not describe the ratio of blue marbles and red marbles

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Which ratio is equivalent to 21:56

sergejj [24]

Which ratio is equivalent to 21:56

Answer: 3:8

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3 years ago

The population of a colony of beetles grows 30% each week. If the initial population is 65 beetles, how many beetles will be the

Crazy boy [7]

This is question of geometric sequence, equation of growth for this matter. The explicit formula for geometric sequence is given by:

a(n) = a(0)r^(n-1)

where;
a(n) = population after time "n"
a(0) = Initial population = 65
n = time = 5 weeks
r = common ratio = (100+30)% = 1.3

Substituting, beetles after 5 weeks will be;
a(5) = 65*1.3^(5-1) = 185.65 ≈ 186 beetles

7 0

4 years ago

There are 25 pens in a container on your desk. Among them, 20 will write well but 5 have defective ink cartridges. You will sele

n200080 [17]

Answer:

3.33% probability that both pens are defective.

Step-by-step explanation:

The pens are chosen without replacement, so we use the hypergeometric distribution to solve this question.

Hypergeometric distribution:

The probability of x sucesses is given by the following formula:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

In which:

x is the number of sucesses.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

In this question:

2 defective, so x = 2.

25 pens, so N = 25.

Two pens will be selected, so n = 2.

5 are defective, so k = 5.

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 2) = h(2,25,2,5) = \frac{C_{5,2}*C_{20,0}}{C_{25,2}} = 0.0333$

3.33% probability that both pens are defective.

5 0

3 years ago

Click on the area of the square 8 cm

PIT_PIT [208]

Answer:

$\huge\boxed{Answer\hookleftarrow}$

Length of each side of the square (s) = 8 cm

Area of the square (a) = ?

$a = s {}^{2} \\ a = 8 {}^{2} \\ a = 8 \times 8 \\ a = 64 \: \: cm {}^{2}$

✐ Area of the square is 64 square centimetres.

ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ

# ꧁❣ RainbowSalt2²2² ࿐

5 0

3 years ago

Read 2 more answers

Translate the sentence into an inequality. The product of y and 9 is less than or equal to 21.

Ede4ka [16]

Answer:

The product of y and 9 is less than 21

Step-by-step explanation:

It is not possible to have an answer that equals 21 unless it is a decimal which is unlikely to happen.

Also can you give brainliest to all of your questions bc it really hard to get brainliest and it be really nice you can choose who i dont really care but just please do it it helps a lot

5 0

3 years ago