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IgorLugansk [536]
2 years ago
13

Two trains leave the city going opposite​ directions, one going north and the other going south. The northbound train is traveli

ng mph slower than the southbound train 14. After 3 hours the trains are 498 miles apart. Find the speed of each train
Mathematics
1 answer:
son4ous [18]2 years ago
8 0
I wish i could help u
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Elodia [21]

Answer:

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Step-by-step explanation:

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3 years ago
Solve x 2 - 4x - 7 = 0 by completing the square. What are the solutions?
Bingel [31]

Answer:

x = 2±sqrt(11)

Step-by-step explanation:

x^2 -4x - 7 =0

Add 7 to each side

x^2 -4x -7+7 =0+7

x^2 -4x =7

To complete the square take the coefficient of the x term and  divide by 2 and then square it.  Add it to both sides

-4 /2 = -2 then square

(-2)^2 = 4

Add 4 to both sides

x^2 -4x+4 =7+4

x^2 -4x+4 = 11

Factor the left side into (x-b/2)^2

(x-2)^2 =11

Take the square root of each side

sqrt((x-2)^2) =±sqrt(11)

x-2 = ±sqrt(11)

Add to to each side

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x = 2±sqrt(11)

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3 years ago
How to solve (8x-30)+(6x+10)=180
lozanna [386]
Add the like terms. So I'll add the variables. 8x+6x is 14x. Now add whole numbers. 30+10 is 40. Our new expression we'll be 14x+40=180. Subtract 40 from 180. 180-40=140. Now we have the expression 14x=140. 140 divided by 14 is 10. So x is 10.
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Goryan [66]
Whats the question?...
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3 years ago
What is a number increased by 7 multiplied by 4?
Lana71 [14]

Answer:

9?

Step-by-step explanation:

9 + 7 is `16, and 16 is a multiple of 4

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