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OverLord2011 [107]
4 years ago
7

Using the cross multiplication method, which of the following is the solution to 21/(x+4) = 7/(x+2)?

Mathematics
2 answers:
Alja [10]4 years ago
8 0

Answer:

3/(x+2)= x+1

Step-by-step explanation:

21/7=3

x/x= x

4/2=2

Makovka662 [10]4 years ago
5 0

Answer:

Step-by-step explanation:

Hello !

Using the cross multiplication method, which of the following is the solution to 21/(x+4) = 7/(x+2)?

21(x + 2) = 7(x + 4)

21x + 42 = 7x + 28

21x - 7x = 28 - 42

14x = -14

x = -14/14

x = -1

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quester [9]

2 blocks = 1 minute

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If we subtract 9 minutes from 30 minutes, we get 21 minutes. Therefore, she needs to run 21 more minutes.

To verify this, we check the proportionality.

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Hope this helps!

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3 years ago
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6 0
4 years ago
What is 1/5 plus 3/4 multiply 1 and 1/4
lesantik [10]

Answer:

1 11/80

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3 years ago
A furniture store has set aside 800 square feet to display its sofas and chairs. Each sofa utilizes 50 sq. ft. and each chair ut
miskamm [114]

Answer:

a) 50S + 30C ≤ 800

b) 1) MAX = S + C

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   3) Max = 6S + 5C

Step-by-step explanation:

Given:

Total space = 800 square feet

Each sofa = 50 square feet

Each chair = 30 square feet

At least 5 sofas and 5 chairs are to be displayed.

a) Write a mathematical model representing the store's constraints:

Let S denote number of sofas displayed and C denote number of chairs displayed.

The mathematical model will be:

50S + 30C ≤ 800

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At least 5 chairs are to be displayed: C ≥ 5

b)

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3) Maximize the total expected daily profit:

Given:

Profit on sofas = $200

Profit on chairs = $100

Max Expected daily profit =

Max = (200S * 0.03) + (100C * 0.05)

<em>Max = 6S + 5C</em>

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3 years ago
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Goryan [66]
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