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Galina-37 [17]
2 years ago
11

8 junior high classes will be chosen to participate in a school improvement survey. there are 21 junior high classes in the scho

ol. in how many ways can the classes be chosen?
Mathematics
1 answer:
-BARSIC- [3]2 years ago
8 0

Step-by-step explanation:

There should be a test for the 21 junior high classes and rules and conditions should be made that the best 8 will be selected.

⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆⬆

Maybe that's not an answer but that's how I understand the question

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Which system of equation is represented​
olga nikolaevna [1]

Answer:

D

Step-by-step explanation:

First, let us figure out what is graphed and then manipulate each answer to try to match it.

The one with a positive slope is

y\leq x-2

The one with the negative slope is

y\geq 3-2x

Now that we have our graphed system of inequalities, we can try to match them to an answer.

A. while the x-2 is the same, the other does not have an x, so it cannot match.

B. The second inequality has the wrong sign, so it is impossible for this to be our answer.

C. When each of these are solved for y, you get y\leq 2x-3\\\\y\leq 2-x. Neither of these match so this cannot be correct.

D. When the first inequality is solved you get y\geq 3-2x

When the second inequality is solved you get y\leq x-2

As both of these answers match our graphed inequalities, D is the correct answer.

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3 years ago
1:what is the range of data?
patriot [66]

Answer:

1. b

2. c

3. c

4 0
3 years ago
Determine the image of the point (5, -2) under a rotation of 90 degrees about the origin.
Galina-37 [17]

90 degrees means 90 degrees counterclockwise.   So from the fourth quadrant we'll end up in the first quadrant.  X and Y get swapped and one negated, it must be the -2 becoming 2, so our image is

(2,5)

Answer: A


8 0
3 years ago
How to write repeating decimals as fractions
nignag [31]

Answer:

You take the repeating group of digits and divide it by the same number of digits but formed only by 9s.

Step-by-step explanation:

Let's say you have 0.111111111111...., your repeating pattern is 1, that consists of one digit (1).  You take that digit and you divide it by 9:

1/9 is the fraction equivalent to 0.111111111111111...

Let's say you have 0.12121212121212...., the repeating pattern is 12, that consists of 2 digits (12).  You take those 2 digits and divide them by 99:

12/99 is the fraction equivalent to 0.12121212121212...

which can be reduced to 4/33

If you have 0.363363363363..., your repeating pattern is 363, which is 3 digits, so you divide 363by 999:

363/999 is the fraction equivalent to  0.363363363363...

which can be simplified to 121/333

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3 years ago
Use the distributive property to express 30 + 75
OleMash [197]
Click on  the box for more details on how to <span>distributive property to express 30 + 75.</span>

8 0
3 years ago
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