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ANTONII [103]
3 years ago
8

-x/3 ≥ 5 is? I need help

Mathematics
2 answers:
tia_tia [17]3 years ago
7 0
I believe the answer is -15.
Scilla [17]3 years ago
4 0

Answer:

x≤-15

Step-by-step explanation:

-x/3≥5

1) Start by multiplying both sides by 3:

-x≥15

2) Now divide both sides by -1: (There is an invisible negative 1 next to the x)

<u>(When you divide by a negative with inequality signs you flip the sign!)</u>

x≤-15

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Washing his dad's car alone, eight-year-old Levi takes 2.5 hours. If his dad helps him, then it takes 1 hour. How long does it t
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Answer:

Levi's dad takes 1.67 hours to wash the car by himself

Step-by-step explanation:

* Lets explain how to solve the problem

- Levi takes 2.5 hours to wash his dad's car alone

- Levi and his dad take 1 hour to wash the dad's car together

∵ Levi takes 2.5 hours to wash the car alone

∴ The rate of Levi is 1/2.5 car/hr

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∴ The rate of his dad is 1/x car/hr

∵ They working together for 1 hour to wash the car

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∵ t is the time of working together

∵ t = 1 hour

∴ \frac{1}{2.5}(1)+\frac{1}{x}(1)=1========\frac{1}{2.5}+\frac{1}{x}=1

- Multiply both sides by 2.5x to cancel the denominators

∵ \frac{1}{2.5}(2.5x)=x=====\frac{1}{x}(2.5x)=2.5

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∴ x + 2.5 = 2.5x

- Subtract x from both sides

∴ 2.5 = 1.5x

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∴ x = 5/3 ≅ 1.67

∵ x is the the time of his dad to wash the car alone

∴ Levi's dad takes 1.67 hours to wash the car by himself

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3 years ago
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