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Sergio039 [100]
3 years ago
7

I am confused on what I need to do. someone please help?

Mathematics
1 answer:
viktelen [127]3 years ago
4 0

Answer:

x = 16

Step-by-step explanation:

Since ∆ABC is congruent to ∆DEC, their corresponding angles would be equal to each other.

<B is congruent to <E, therefore,

<B = <E

x + 15 = 6x - 65 (substitution)

Collect like terms

x - 6x = -15 - 65

-5x = -80

Divide both sides by -5

x = 16

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Lets be a price of the calculator - $ a
then , after using the coupon, you need to pay $(a-18)
and after using 15% discount , you need to pay (1-0.15)a=0.85a

then, if 
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but if the price of the calculator is less than $120, you should choose $ 18 coupon.

for example, we have the price of the calculator $100
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100*0.85 =85, coupon is better.

If the price of the calculator $200
200-18=182,
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if price of the calculator is $120,
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120*0.85=102, 
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