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2 years ago

Help on theese 2 for brainly tell me why we need to regroup

Mathematics

1 answer:

svlad2 [7]2 years ago

4 0

Answer:

You will need to regroup because 2/3 is less than 3/4.

Step-by-step explanation:

DON'T IGNORE THIS PART!!!

Let's find the common denominator for 10 2/3 and 6 3/4.

$10 \frac{2}{3} - 6 \frac{3}{4}$

What is the least common multiple for 3 and 4? Well, let's make a list that would help!

Multiples of 3: 3, 6, 9, <u>12</u>, 15, 18, 21...

Multiples of 4: 4, 8, <u>12</u>, 16, 20, 24, 28...

What is the first multiple that 3 and 4 matches with? It is 12!

Now, let's convert the fractions.

$10 \frac{2}{3} - 6 \frac{3}{4}$ = $10 \frac{8}{12} - 6 \frac{9}{12}$

Woah! How do you subtract 9/12 from 8/12? Don't worry--there is a solution to this problem! And--it is... regrouping!

You have to add a whole to 8/12. This means that you have to add 8/12 + 12/12, which is 20/12. And--you will have to subtract one from ten.

$9 \frac{20}{12} - 6 \frac{9}{12}$

Now, that should be way easier to subtract!

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Nataly [62]

Answer:

Jupiter is so big that all the other planets in the solar system could fit inside it. More than 1,300 Earths would fit inside Jupiter. Jupiter is the fifth planet from the sun. From Earth, it is almost always the second brightest planet in the night sky.

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2 years ago

In a MBS first year class, there are three sections each including 20 students. In the first section, there are 10 boys and 10 g

KIM [24]

Answer:

$3.52 \times 10^{-9} = 3.52 \times 10^{-7}\%$ probability that all the 15 students selected are girls

Step-by-step explanation:

The selection is from a sample 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.

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

All girls from the first group:

20 students, so $N = 20$

10 girls, so $k = 10$

5 students will be selected, so $n = 5$

We want all of them to be girls, so we find P(X = 5).

$P_1 = P(X = 5) = h(5,20,5,10) = \frac{C_{10,5}*C_{10,5}}{C_{20,5}} = 0.0163$

All girls from the second group:

20 students, so $N = 20$

5 girls, so $k = 5$

5 students will be selected, so $n = 5$

We want all of them to be girls, so we find P(X = 5).

$P_2 = P(X = 5) = h(5,20,5,5) = \frac{C_{5,5}*C_{15,5}}{C_{20,5}} = 0.00006$

All girls from the third group:

20 students, so $N = 20$

8 girls, so $k = 8$

5 students will be selected, so $n = 5$

We want all of them to be girls, so we find P(X = 5).

$P_3 = P(X = 5) = h(5,20,5,8) = \frac{C_{8,5}*C_{12,5}}{C_{20,5}} = 0.0036$

All 15 students are girls:

Groups are independent, so we multiply the probabilities:

$P = P_1*P_2*P_3 = 0.0163*0.00006*0.0036 = 3.52 \times 10^{-9}$

$3.52 \times 10^{-9} = 3.52 \times 10^{-7}\%$ probability that all the 15 students selected are girls

7 0

3 years ago

What is the hcf of 45 and 100

Ira Lisetskai [31]

Answer:

45 100

/ \ / \

3 × 15 2×50

/ \ / \

3× 5 2×25

/ \

5×5

45 : 3×3×5

100: 2×2×5×5

common : 3×5

HCF: 15

6 0

2 years ago

$5.42 in change. How much did each bag of chips cost?

Gnoma [55]

Answer:

$2.71

Step-by-step explanation:

Hey!

I multiplied $2.71 by 2 and that gave me $5.42

3 0

3 years ago

Read 2 more answers

How did they get -1 for -3(x-1)+3=9-2(x+1)

Ira Lisetskai [31]

Answer:

by answering hte questin

Step-by-step explanation:

3 0

2 years ago