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Blizzard [7]
3 years ago
6

A math teacher needs to choose 6 students from a class of 30 to go to the library. How many different groups can she select?

Mathematics
2 answers:
V125BC [204]3 years ago
6 0

Answer:

593775ways

Step-by-step explanation:

Combination has to do with selection of r objects from a total number of n objects and this can be done in nCr ways. Generally,

nCr = n!/(n-r)!r!

Since the math teacher has to select 6 students from a class of 30, this can be done in 30C6 number of ways to have;

30C6 = 30!/(30-6)!6!

30C6 = 30!/24!6!

30C6 = 30×29×28×27×26×25×24!/24!×6×5×4×3×2

30C6 = 30×29×28×27×26×25/6×5×4×3×2

30C6 = 427,518,000/720

30C6 = 593775ways

This means, the selection can be made in 593775ways

Molodets [167]3 years ago
3 0
She can select 5 different groups...
30/6=5

Hope this helps leave a 5-rate and a thanks
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seraphim [82]

Answer:

Step-by-step explanation:

<em>Step 1: Determine quantity per liquid</em>

liquid 1=7/8 cup

liquid 2=9/10 cup

<em>Step 2: Derive expression to calculate total amount of mixture</em>

The expression below can be derived;

T=a+b

where;

T=total amount of mixture

a=total amount of liquid 1

b=total amount of liquid 2

In our case;

a=7/8 cup

b=9/10 cup

replacing;

T=(7/8)+(9/10)=1 31/40 cups

The total amount of mixture=1 31/40 cups

3 0
2 years ago
Please answer this correctly
Romashka-Z-Leto [24]

Answer:

5/6

Step-by-step explanation:

There are 5 numbers that fit the rule, 2, 4, 5, 6, 7. There are 6 numbers total so there is a 5/6 chance spinning on one of them.

7 0
3 years ago
Read 2 more answers
2/3 - 3/2y + 1/3y + 4 = 0​
Korvikt [17]

Answer:

y = 4

Step-by-step explanation:

(2/3 + 4) + (-3/2y + 1/3y) = 0

(-3/2y + 1/3y) = -4 2/3

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cross-multiply:

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7 0
2 years ago
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The points (–4, –3) and (–1, –8) are on a line. Find the intercepts to the nearest tenth.
I am Lyosha [343]

The intercepts are the points where the line meets with the x axis and the y axis. First let us find the equation of the line.

Finding slope:

slope=change in y/change in x (y2-y1/x2-x1)

slope=-3-(-8)/-4-(-1)=5/-3=-5/3

Finding y-intercept:

y=mx+b

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b=-9 2/3

y intercept: (0,-9 2/3)

Equation: y=-5/3x-9 2/3

Since we already have the y intercept let us find the x intercept by plugging 0 in the place of y in the equation.

0=-5/3x-9 2/3

x=29/3x(-3/5)

x=-29/5

x intercept: (-29/5,0)

answers: (0,-9 2/3) and (-29/5,0)

4 0
3 years ago
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Answer:

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