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White raven [17]
3 years ago
12

(3+6)÷(-3)^2 help !!!!!

Mathematics
2 answers:
Serjik [45]3 years ago
5 0
Your answer would be 1...
Alexandra [31]3 years ago
5 0
It should come out to one
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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
Dmitry [639]

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

∵ His dad takes x hours to wash the car alone

∴ The rate of his dad is 1/x car/hr

∵ They working together for 1 hour to wash the car

- The equation of the work is rate of Levi × t + rate of his dad × t = 1

∵ 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

∵ 1 × (2.5x) = 2.5x

∴ x + 2.5 = 2.5x

- Subtract x from both sides

∴ 2.5 = 1.5x

- Divide both sides by 1.5

∴ 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

3 0
3 years ago
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The area of a rectangle is 70 square inches.
german
The correct answer is A.

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3 years ago
Given the inequality of x < 5, select all the
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Yesterday,Bethany sent 60 text messages. she said 15 percent of those messages were to her best friend. How many texts messages
dimulka [17.4K]

Answer:

9

Step-by-step explanation:

We have to multiply 60 by 15%

15% = \frac{15}{100} = 0.15, hence

number of text = 60 × 0.15 = 9


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3 years ago
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Find the sum of the even numbers shown below. 2+4+6+8+...+66+68+70​
Mandarinka [93]

The sum its +2

2+2=4

4+2=6

6+2=8

8+2=10

And so on the numbers just keep sum for 2

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