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svp [43]
3 years ago
11

When Sandy and Allen's mother decorates the house for a holiday by herself, it takes her 5 hours. When both Sandy and Allen help

, the three can finish the job in 2.5 hours. When only Allen helps his mother decorate, it takes the two 3.5 hours. How long would it take Sandy to decorate the house by herself?
Mathematics
2 answers:
Reil [10]3 years ago
7 0

Answer:

5 hours

Step-by-step explanation:

saveliy_v [14]3 years ago
5 0

Answer:

8 3/4

Step-by-step explanation:

time for all work:

Mother - 5 hours

Mother + Sandy + Allen - 2.5 hours

Mother + Allen - 3.5 hours

Sandy - x

In 1 hour

Mother - 1/5

Mother + Sandy + Allen - 2/5

Mother + Allen - 2/7

Sandy - 1/x

(M+S+A) - S = (M+A)

2/5 - 1/x = 2/7

solve equation

x = 8 3/4 hours

Hope this helps :)

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3 years ago
The exppreson of 10x^2-7
erica [24]

The complete question is :

Question: What is the coefficient in the expression 10x²-7?

The coefficient in the expression 10x^{2} -7 is 10

<h3>What is Coefficient?</h3>

A numerical or constant quantity placed before and multiplying the variable in an algebraic expression.

According to the question,

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The variable given is x

We need to find the coefficient in the expression.

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Hence the coefficient in the expression is 10.

Learn more about coefficient here:

brainly.com/question/22241464

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Please help me this is very important:
zubka84 [21]
Is this for English it makes no sense at all if anything it should be for math dose not make sense at all........................................................................................................................................
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Read 2 more answers
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