3 years ago

Factorise the following

Mathematics

1 answer:

Vika [28.1K]3 years ago

3 0

For a), common terms between them are x & y
Thus, xy(3x+5y)

For b), I'm guessing the answer is (m+n)(x+y)

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In a sociology class there are 1414 sociology majors and 1111 non-sociology majors. 33 students are randomly selected to present

saul85 [17]

Answer: $0.4065$

Step-by-step explanation:

Given : In a sociology class there are 14 sociology majors and 11 non-sociology majors.

Total students = 14+11=25

Number of students are randomly selected = 3

Then, the number of ways to select 3 students from 25 students :-

$^{25}C_3=\dfrac{25!}{(25-3)!3!}=\dfrac{25\times24\times23\times22!}{22!3!}\\\\=2300$

Number of ways to select at least 2 of the 3 students re non-sociology majors :-

$^{14}C_1\times^{11}C_2+^{14}C_0\times ^{11}C_{3}\\\\=(14)\times\dfrac{11!}{2!(11-2)!}+(1)\times\dfrac{11!}{3!(11-3)!}\\\\=(14)(11\times5)+\dfrac{11\times10\times9}{6}\\\\=770+165=935$

The probability that at least 2 of the 3 students selected are non-sociology majors will be :-

$\dfrac{935}{2300}=0.40652173913\approx0.4065$

8 0

3 years ago

Translate this into an equation <br> Seven times the sum of a number and 9 equals 8.

zhenek [66]

Answer:

7(9+n)=8

Step-by-step explanation:

I hope this is right :)))

5 0

3 years ago

I need help with this it’s about Function 8.F.2

Ymorist [56]

Answer:

Step-by-step explanation:

3 0

2 years ago

What is The sum of b and 11

max2010maxim [7]

B+11 ? I’m not sure is this high school math ?

6 0

3 years ago

8. Which of the following are equivalent to 50? Select all that apply. A. 10% of 5,000 B. 20% of 250 C. 25% of 200 D. 30% of 150

Alex

Answer:

B. 20% of 250

would be 50

4 0

3 years ago