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erik [133]
3 years ago
15

Find the value of x2 − 7x + 9 when x = 6. The value of the expression when x = 6 is

Mathematics
1 answer:
Maru [420]3 years ago
7 0

Answer:

-21.

Step-by-step explanation:

(6)2-7(6)+9

--> 6x2= 12

--> 7x6= 42

Rewrite the expression:

--> 12-42+9

Solve:

--> 12-42= -30

--> -30+7= -21

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4 0
3 years ago
2x + 7 = 27 or 3 + 3x = 30
Leokris [45]

Step-by-step explanation:

2x + 7 = 27 OR 3 + 3x = 30.

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2x = 20 OR 3x = 27

x = 20/2 OR x = 27/3

x = 10 OR x = 9

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2 years ago
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6 0
3 years ago
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Charlotte’s weekly paycheck is based on the number of hours worked during the week and on the weekend. If she works 13 hours dur
Schach [20]
X: earn per  hour during the week
y: earn per hour during the weekend

13x + 14y = 250.90
15x + 8y = 204.70

Multiply the first equation by 4 and the second equation by 7

52x + 56y = 1003.6
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Subtract the first equation from the second:

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x = 429.30/ 53
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y = [204.70 - 15(8.10)]/8 = 10.40

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Answer: she earns $2.30 per hour more during the weekend than during the week.


8 0
3 years ago
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