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irina1246 [14]
3 years ago
14

Using the expression 7x - 5, find the value when x is 3.

Mathematics
2 answers:
Allisa [31]3 years ago
7 0
Plug in 3 to the equation

7(3)-5

21-5

= 16
JulsSmile [24]3 years ago
4 0

Answer: 16

7 time 3 is 21

21 - 5 = 16

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Step-by-step explanation:

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Why is the answer B?
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Remark

Whatever the original price, he gets 70% in the first instance.

He gets 80% in the second instance.

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Let the original price be x

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So the watches should have brought in 3*100 = 300 dollars.

He only brought in 240 dollars.

He lost 300 - 240 = 60 dollars.

The answer is B.

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