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frutty [35]
3 years ago
14

Use factoring to write an equivalent expression 15 x +9

Mathematics
2 answers:
Tamiku [17]3 years ago
6 0

Answer:Add  15 to both sides of the equation.  x = − 9 + 15

Add  − 9  and  15 . x = 6

Rashid [163]3 years ago
6 0

Answer:

you can do many ways one would be 3(5x times 3) (hope this helps and please give me brainliest)

Step-by-step explanation:

9 and 15  have a common factor of 3

divide 15x by 3 which is 5x

then do 9 divided by 3 which is 3

then put 3 outside parentheses and put 5x to show 15x and 3 to show the 9

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3 years ago
Flying against the wind, an airplane travels 4000 kilometers in 5 hours. Flying with the wind, the same plane travels 5040 kilom
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Answer:the plane in still air is 904 km/h

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Step-by-step explanation:

Let x represent the rate or speed of the plane in still air.

Let y represent the rate or speed of the wind.

Flying against the wind, an airplane travels 4000 kilometers in 5 hours. This means that the total speed of the airplane would be (x - y) km/h

Distance = speed × time

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4000 = 5(x - y)

4000 = 5x - 5y - - - - - - - - -1

Flying with the wind, the same plane travels 5040 kilometers in 4 hours. This means that the total speed of the airplane would be (x + y) km/h. Therefore,

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Multiplying equation 1 by 4 and equation 2 by 5, it becomes

16000 = 20x - 20y

20160 = 20x + 20y

Subtracting, it becomes

- 4160 = - 40y

y = - 4160/-40

y = 104

Substituting y = 104 into equation 1, it becomes

4000 = 5x - 5 × 104

4000 = 5x - 520

5x = 4000 + 520

5x = 4520

x = 4520/5 = 904

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