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Sophie [7]
3 years ago
13

Solve this please, and quick

Mathematics
2 answers:
rosijanka [135]3 years ago
8 0
Error: They subtracted 9x from both sides when they should have subtracted 12. You can’t subtract unlike terms
Correct: x=-5/16
Subtract 12 from both sides to get -5 on the left and add 7x and 9x to get 16x. Divide both sides by 16 to isolate x.
Viefleur [7K]3 years ago
3 0

Answer:

3.2

Step-by-step explanation:

7x + 12 + 9x = 7

16x + 12 = 7

       - 12    -12

16x = -5

16 divided by -5 is 3.2

x = 3.2

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4 years ago
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7. Use the discriminant to determine how many real number solutions exist for the quadratic equation –4j2 + 3j – 28 = 0.
GrogVix [38]
\bf \begin{array}{llccll}
y=&{{ -4}}j^2&{{ +3}}j&{{ -28}}\\
&~\uparrow &\uparrow &\uparrow \\
&~a&b&c
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\\\\\\
discriminant\implies b^2-4ac=
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6 0
3 years ago
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Which is the value of x?<br><br> a. x=3<br> b. x=6.5<br> c. x=8.5<br> d. x=14
Elodia [21]

Answer:

x = 14

Step-by-step explanation:

The angles form a straight line which makes them add to 180 degrees

4x+ 8x+12 =180

Combine like terms

12x+12 =180

Subtract 12 from each side

12x+12-12 = 180-12

12x=168

Divide each side by 12

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4 0
3 years ago
5x - 3
valentina_108 [34]

PQ is bisected by line <em>L</em>.

so the answer is C

PQ=14

Step-by-step explanation:

5x-3=11-2x

5x+2x=11+3

7x=14

x=2

replace X in any of the given distance equation then multiply by 2 since the distance Pm=Qm

PQ=2(11-2x)

2(11-2(2))

2(7)

Therefore PQ=14

5 0
3 years ago
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Luba_88 [7]

Answer:

$517.50

Step-by-step explanation:

25x20.7

8 0
3 years ago
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