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2 years ago

Which expression is equivalent to 2x + x^2 + 3x + 5x^2 - 10x?

2 answers:

8 0

2x + x² + 3x + 5x² - 10x (combine like terms)
6x² + 5x -10x
6x² - 5x
which is the same as
-5x +6x²
Your answer is C

diamong [38]2 years ago

3 0

Answers is C
X^2 + 5x^2 + 2x+3x- 10x
6x^2 + 5x - 10x
-5x + 6x^2

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2 years ago

A president, treasurer, and secretary, all di erent, are to be chosen from a club consisting of 12 people (whose names are I, J,

Ierofanga [76]

Answer:

There are 220 choices

Step-by-step explanation:

Given

$People = 12$

$Selection =3$ (President, Treasurer and Secretary)

Required

Determine number of selection (if no restriction)

This is calculated using the following combination formula:

$^nC_r = \frac{n!}{(n - r)!r!}$

Where

$n = 12$

$r= 3$

So, we have:

$^nC_r = \frac{n!}{(n - r)!r!}$

$^{12}C_3 = \frac{12!}{(12 - 3)!3!}$

$^{12}C_3 = \frac{12!}{9!3!}$

$^{12}C_3 = \frac{12*11*10*9!}{9!3!}$

$^{12}C_3 = \frac{12*11*10}{3!}$

$^{12}C_3 = \frac{12*11*10}{3*2*1}$

$^{12}C_3 = \frac{12*11*10}{6}$

$^{12}C_3 = 2*11*10$

$^{12}C_3 = 220\ ways$

There are 220 choices

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