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boyakko [2]
3 years ago
11

Mr. Dupee bought a novel at a bookstore on sale for 20% off its regular price of $29.99. Mr. Edgar bought the same novel at a di

fferent bookstore for 10% off its regular price of $25. Who received the better discount? EXPLAIN ANSWER PLEASE :3
Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
3 0
Mr Dupee: $29.99x(1-20%)
                =$29.99x0.8
                =$24.00
 
<span>Mr. Edgar: $25x(1-10%)
                =$25x0.9
                =$22.50
 
$24.00>$22.50
Mr. Edgar got a better </span>discount.
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<h3>Hello!</h3>

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In order to find the vertex of a parabola, we use the following formula:

\bold{\displaystyle\frac{-b}{2a} }}

Remember, a parabola looks like so:

\tt{y=ax^2+bx+c}

Now we know what a and b stand for.

In this case, b is -4, and a is -1:

\hookrightarrow\sf{\displaystyle\frac{-(-4)}{2(-1)}

Simplify:

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Divide:

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<h3>Notes:</h3>
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  • Let me know if you have any questions!
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