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Fittoniya [83]
3 years ago
7

-12(r + 4) =72 please help

Mathematics
2 answers:
Ivahew [28]3 years ago
6 0
The answer is r= -10
mr Goodwill [35]3 years ago
5 0
I believe r would equal -10
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Two planes, which are 2235 miles apart, fly toward each other. Their speeds differ by 95 mph. If they pass each other in 3 hours
lora16 [44]

Answer:

325 mph and 420 mph

Step-by-step explanation:

If the speed of the slower plane is x, then the speed of the faster plane is x + 95.

The distance traveled by the slower plane is 3x.

The distance traveled by the faster plane is 3(x + 95).

The total distance is 2235 miles.

3x + 3(x + 95) = 2235

3x + 3x + 285 = 2235

6x = 1950

x = 325

x + 95 = 420

The speed of the planes is 325 mph and 420 mph.

5 0
3 years ago
He simultaneous equations<br>5x + y = 21<br>x - 3y = 9 <br><br>With working out​
Elza [17]

Answer:

see explanation

Step-by-step explanation:

Given the 2 equations

5x + y = 21 → (1)

x - 3y = 9 → (2)

Multiply (1) by 3 and add the result to (2) to eliminate y term

15x + 3y = 63 → (3)

Add (2) and (3) term by term

(x + 15x) + )- 3y + 3y) = (9 + 63)

16x = 72 ( divide both sides by 16 )

x = 4.5

Substitute x = 4.5 into (1) for corresponding value of y

22.5 + y = 21 ( subtract 22.5 from both sides )

y = - 1.5

Solution is (4.5, - 1.5 )

8 0
3 years ago
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kirza4 [7]

Answer:

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7 0
3 years ago
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Gemiola [76]
Nineteen million, two hundred sixty-six thousand, four hundred twenty! :)
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3 years ago
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svlad2 [7]

Answer:

1.8.

Step-by-step explanation:

9 divided by 5 is 1.8.

6 0
3 years ago
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