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3 years ago

There are 9 students in a class: 7 boys and 2 girls.

Mathematics

2 answers:

Lilit [14]3 years ago

5 0

I think the teacher would probably pick two boys and one girl

Mrrafil [7]3 years ago

3 0

Answer:

Step-by-step explanation:

There are 9C3 total ways of picking 3 people from 9 where order does not matter.

To pick 3 boys from 6, you must do 6C3

When you do both of these you divide the smaller by the larger.

9C3 = 84

6C3 = 20

So the probability that you want is

20/84 = 0.238

If you are uncertain where the 84 comes from, it is calculated like this

9*8*7*6! The 6!s cancel out and you are left with

=======

6! * (9 -6)!

9C3 = 9*8*7/3!

9C3 = 3 * 4 * 7 = 84

6C3 is done exactly the same way.

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X+2(x+3(x+4(x+5)))=153

Allushta [10]

Answer:

$x=1$

Step-by-step explanation:

Here first open the inner parentheses and use the distributive property,

$4(x+5)=4x+20\\\\(x+4(x+5))=(x+4x+20)=(5x+20)\\\\3(x+4(x+5))=3(5x+20)=15x+60\\\\(x+3(x+4(x+5)))=(x+15x+60)=16x+60\\\\2(x+3(x+4(x+5)))=2(16x+60)=32x+120\\\\x+2(x+3(x+4(x+5)))=x+32x+120=33x+120\\\\\\Hence\ x+2(x+3(x+4(x+5)))=x+32x+120=33x+120\\\\\Rightarrow 33x+120=153\\\\33x=153-120\\\\33x=33\\\\x=1$

3 0

3 years ago

What is 12 divided by 3/4

Tpy6a [65]

12 divided by 3/4 =
16

<span>It is 16 because the reciprocal of 3/4 is 4/3 and 12 as a fraction is 12/1. So 12/1 x 4/3 is 48/3. And if you divide 48 by 3 you will get 16. If you don't get 16 then you did the wrong calculation.</span>

Hope I Helped You!!! :-)

Have A Good Day!!!

8 0

3 years ago

Read 2 more answers

What is the equation for this math problem? Steven spent $90 on clothes. He bought a pair of jeans that cost $34 and spent the r

dexar [7]

Answer:

The equation for the given maths problem is $ 34 + $ 8x = $ 90

Step-by-step explanation:

According to question :

The Total amount spent on cloths = $ 90

The cost of a pair of jeans = $ 34

The cost of each t-shirt pair = $ 8

The amount spent on t-shirt = $ 90 - $ 34 = $ 56

Let the number of t-shirt pair = x

So, $ 34 + $ 8x = $ 90

Or, $ 8x = $ 90 - $ 34

∴ x = $\frac{ 90 - 34}{8}$

Hence The equation for the given maths problem is $ 34 + $ 8x = $ 90 Answer

8 0

3 years ago

Two pieces of equipment were purchased for a total of $4000. If one piece cost $850 more than

ruslelena [56]

The price of less expensive equipment is $1575.

Step-by-step explanation:

Let,

Price of one equipment = x

Price of other equipment = y

According to given statement;

x+y=4000 Eqn 1

x = y+850 Eqn 2

Putting Eqn 2 in Eqn 1

$(y+850)+y=4000\\y+850+y=4000\\2y=4000-850\\2y=3150$

Dividing both sides by 2;

$\frac{2y}{2}=\frac{3150}{2}\\y=1575$

Putting y=1575 in Eqn 2;

$x=1575+850\\x=2425$

The price of less expensive equipment is $1575.

Keywords: linear equation, substitution method

Learn more about linear equations at:

#LearnwithBrainly

3 0

3 years ago

What measurement is equal to 6 kilograms

natima [27]

Answer:

in grams 6 kilograms is equal to 6000 grams or 13.2276 pounds

multiply 6 by each number don't forget to do the zero's.

4 0

4 years ago