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zysi [14]
3 years ago
14

một lớp học có 20 người. Hỏi có bao nhiêu cách bầu ra một ban lãnh đạo gồm một lớp trưởng, một bí thư và một lớp phó. Yêu cầu kh

ông được bầu một người vào 2 hoặc 3 chức vụ
Mathematics
1 answer:
scoray [572]3 years ago
6 0

Answer:

MNNNNNNNNNNNNNNNNNNNNNNNNm

Step-by-step explanation:

nknnnnnnnnnnnnnnnnnnnkkkkkkkkkkkkknknklol

loser

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3 0
3 years ago
Select the correct answer.
Burka [1]

The equation in which b varies directly as the <em>square</em> root of c is b = 50 · √c. (Correct choice: B)

<h3>What is the equation of the direct variation between two variables?</h3>

In this problem we have a case of <em>direct</em> variation between two variables, which is mathematically described by a <em>direct proportionality</em> model, whose form and characteristics are shown below:

b ∝ √c

b = k · √c      (1)

Where k is the <em>proportionality</em> constant.

First, we determine the value of the constant of proportionality by substituting on b and c and clearing the variable: (b = 100, c = 4)

k = b / √c

k = 100 / √4

k = 100 / 2

k = 50

Then, the equation in which b varies directly as the <em>square</em> root of c is b = 50 · √c. (Correct choice: B)

To learn more on direct variation: brainly.com/question/14254277

#SPJ1

7 0
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