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dangina [55]
3 years ago
8

Twice a number is three more than nine​

Mathematics
2 answers:
antoniya [11.8K]3 years ago
8 0

answer: how we supposed to do it?

Step-by-step explanation:

i don't even understand

KonstantinChe [14]3 years ago
5 0

Answer:

6

Step-by-step explanation:

Let that number be <em>x</em>.

2x = 9 + 3

2x = 12

x = 6

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Find the simultaneous equation x-2y=1,y^2-3xy+8=0​
Hitman42 [59]

Answer:

  (-2.2, -1.6), (3, 1)

Step-by-step explanation:

You don't have to go far to find the equations. They are right there in your problem statement. Perhaps you want to find the solutions to the equations.

Use the first equation to write an expression for x, then substitute that into the second equation:

  x = 2y +1

  y^2 -3(2y+1)(y) +8 = 0

  -5y^2 -3y +8 = 0

  -(5y +8)(y -1) = 0

  y = -8/5   or   y = 1

The corresponding values of x are ...

  x = 2(-8/5)+1 = -11/5

  x = 2(1) +1 = 3

The solutions are (x, y) = (-2.2, -1.6) and (3, 1).

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2 years ago
Bridget was thinking of a number. Bridget doubles it, then adds 15 to get an answer of 16.4. What was the original number?
lyudmila [28]
0.7 is the correct number:)
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3 years ago
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PLS HELP ILL MARK BRAINLIST
Genrish500 [490]

Step-by-step explanation:

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3 years ago
Sam saw 2 bottles of ketchup at the store for the same price. One bottle contained 4 pints of ketchup and the other contained 1.
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Solve 250 divide 5 divide 10 making sure to divide in proper order
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