3 years ago

How to know if a problem is permutation or combination?

1 answer:

6 0

If the order matters it is a permutation. For example: if you are selecting 3 people to be on a committee it doesn't matter what order you select them, but if you're selecting three people to be president, vice president, and secretary the order in which you choose them matters the first person being president, the second person being vice president, and the third person be secretary

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Which is a solutiom (x-3)(x + 9)=-27?

Elis [28]

The solution is x= 0,-6

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3 years ago

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Solve the system by substitution: 3x + 2y = 26 Y=x + 3

Orlov [11]

Answer:

x = 4

Step-by-step explanation:

3x + 2y = 26

y = x + 3

Plug in the equation for y

3x + 2(x + 3) = 26

Multiply the 2 with what is in the parantheses

3x + 2x + 6 = 26

Combine like terms and solve for x

5x + 6 = 26

5x = 20

x = 4

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3 years ago

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During their summer break from school. Hortencia and Alex decide to paint houses to earn money. Hortencia charges a flat rate of

PIT_PIT [208]

Answer:

The answer to your question is: 20 hours.

Step-by-step explanation:

Data

Hortencia = $350

Alex $18 / h

# hours Alex must paint to make more money than Hortencia = ?

Process

Equation 18 x n > 350

n > 350 / 18

n > 19.4 hours

If Alex work 19.4 hours, he will make the same amount of money than Hortencia, then He needs to work 20 hours.

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3 years ago

What is the inverse of the function f(x) = x – 12?

SashulF [63]

$y=x-12\\
x=y+12\\
f^{-1}(x)=x+12$

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3 years ago

Add the two expressions. 3z−4 and 2z + 5 Enter your answer in the box.

Ainat [17]

Answer:

5z+1

Step-by-step explanation:

(3z-4)+(2z+5)

3z-4+2z+5

3z+2z-4+5

5z-4+5

5z+1

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3 years ago

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