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Katarina [22]
3 years ago
14

Twelve education students, in groups of four, are taking part in a student-teacher program. Mark cannot be in the first group be

cause he will be arriving late.
How many ways can the instructor choose the first group of four education students?

Please explain step by step how to get the answer.
Mathematics
2 answers:
Rina8888 [55]3 years ago
8 0
This is a combination problem.

Given:
12 students
3 groups consisting of 4 students.
Mark can't be in the first group.

The combination formula that I used is: n! / r!(n-r)!
where: n = number of choices ; r = number of people to be chosen.

This is the formula I used because the order is not important and repetition is not allowed. 

Since Mark can't be considered in the first group, the value of n would be 11 instead of 12. value of r is 4.

numerator: n! = 11! = 39,916,800
denominator: r!(n-r)! = 4!(11-4)! = 4!*7! = 120,960

Combination = 39,916,800 / 120,960 = 330

There are 330 ways that the instructor can choose 4 students for the first group


GuDViN [60]3 years ago
4 0

The correct answer is:

B. 330

The instructor can choose the first group of four education students 330 ways.

|Huntrw6|

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Answer:

22/7

Step-by-step explanation:

Diameter is 2m

we know,

radius= Diameter/2

r = d/2

r = 2/2

r = 1

Now,

area of circle= πr^2

22/7 * 1^2

22/7 ....... answer

7 0
3 years ago
Read 2 more answers
Which two lines are parallel?<br> Which two lines are perpendicular?
lana66690 [7]

Answer:

see explanation

Step-by-step explanation:

Parallel lines have equal slopes

The product of the slopes of perpendicular lines = - 1

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

All the equations given are in slope- intercept form

y = 2x + 1 → with m = 2

y = \frac{1}{2} x - 4 → with m = \frac{1}{2}

y = x + 1 → with m = 1

y = - \frac{1}{x} x - 3 → with m = - \frac{1}{2}

y = 10 + x → y = x + 10 → with m = 1

Thus

y = x + 1 and y = 10 + x are Parallel since both have m = 1

y = 2x + 1 and y = - \frac{1}{2} x - 3 are Perpendicular since 2 × - \frac{1}{2} = - 1

7 0
3 years ago
Trevor is swimming laps to raise money for the local food bank. He earns $1.85 per lap and has already swum 23 laps.
Mrac [35]
1.85x-42.55>100 is the inequality. 42.55 is the amount already raised, 1.85x is number of laps times the money raised by them.
6 0
3 years ago
Convert 17.42 m to customary units. A.57'-17/8" B. 36-10 1/2" C. 442 1/2" D. 367/8" E. None of these answers is reasonable.
Allushta [10]

Answer:

E. None of these answers is reasonable.

Step-by-step explanation:

Customary units are inches, feet, yards, and miles.

Since,

1 foot = 0.3048 meters,

⇒ 1 meter = \frac{1}{0.3048} feet,

17.42 meters = \frac{17.42}{0.3048} feet

=\frac{174200}{3048}\text{ feet}

=57\frac{ 464}{3048}\text{ feet}

=57\frac{58}{381}\text{ feet}

Now, 1 feet = 12 inches,

⇒ \frac{58}{381} feet = \frac{12\times 58}{381} inches

= \frac{232}{381}\text{ inches}

Hence,

17.42 meters = 57\text{ feet }\frac{232}{381}\text{ inches}

= 57' 232/127''

That is, None of these answers is reasonable.

8 0
3 years ago
Please can someone help me please
Tomtit [17]
You can use variables to solve this problem. Lets say that m is men, w is women, and c is children. m+w+c=266
four times as many men as children in ‘math words’ would be 4c=m
twice as many women as children would be 2c=w
what we can do now is plug those in to make everything easier with one variable
4c+2c+c=266
7c=266
c=38 now we have how many children, and we need to plug it back into what we have for women and men.
4c=m 4(38)=m m=152
2c=w 2(38)=w w=76


152 men, 76 women, and 38 children
7 0
3 years ago
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