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expeople1 [14]
2 years ago
12

If 3x - 2 = -x + 10, then x =

Mathematics
2 answers:
Kipish [7]2 years ago
5 0

Answer:

3

Step-by-step explanation:

3x-2= -x+10

4x= 12

x=3

tekilochka [14]2 years ago
4 0
X=3 that was easyyyyyyyyyyy
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John is 3 years older than Susan and khalid is 5 years younger than her . The sum of their ages is 40 .
lapo4ka [179]

Answer:

John is 17,

Susan is 14,

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Step-by-step explanation:

a = John's age

b = Susan's age

c = Khalid's age

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Now, we can solve for b through substitution.

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8 0
3 years ago
The sum of the squares of three consecutive integers is 509. Determine the integers.
GalinKa [24]

Answer:

12, 13, 14

Step-by-step explanation:

Denote the integers as:

x

x+1

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(x^(2)) + (( x + 1 )^(2)) + (( x + 2 )^(2)) = 509

write out the squares

x^2 + x^2 + 2x + 1 + x^2 + 4x + 4 = 509

combine like terms

3x^2 + 6x + 5 = 509

inverse operations

3x^2 + 6x + 5 = 509

                -5     -5

3x^2 + 6x = 504

factor

3x^2 + 6x = 504

3 ( x^2 + 2x ) =504

Inverse operations

3 ( x^2 + 2x ) = 504

/3                       /3

x^2 + 2x = 168

Factor again

x ( x + 2 ) = 168

At this point, it should be obvious that x is 12 (because 12 * 14 = 168)

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6 0
3 years ago
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