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kobusy [5.1K]
3 years ago
10

The Hogwarts Express train has reduced its one-way fare from 360 galleons to just 270 galleons. What is the percentage decrease

in the fare? *
Mathematics
1 answer:
Likurg_2 [28]3 years ago
4 0
<h3>Answer:   25% decrease</h3>

=======================================================

Work Shown:

A = old value = 360

B = new value = 270

C = percent change

C = (B-A)/A

C = (270-360)/360

C = -90/360

C = -0.25

C = -25%

The negative C value indicates we have a percent decrease.

Note how 25% of 360 = 0.25*360 = 90, meaning that the price has dropped by 90 galleons. And also note that 360-270 = 90 is that same figure of 90. This helps confirm the answer.

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Step-by-step explanation:

All you have to do is the following formula: 1° × π/180 = ? Further explanation below:

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2 years ago
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Answer:

D

Step-by-step explanation:

Here, we want to get the equation of the line perpendicular to;

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y = mx + c

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The slope is -3

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Thus;

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ryzh [129]

Answer:

y = (-7/3)(x - 9)

Step-by-step explanation:

<em><u>(12, - 7)</u></em>

y = a(x - h)^2

-7 = a(12 - h)^2

- 7 = a(144 - 24x + h^2)

<em><u>(9,0)</u></em>

0 = a(x - h)^2

0 = a(9 - h)^2

0 = a(81 - 18h + h^2)

From (9,0) we can conclude that

a = 0

or

(9 - h)^2 = 0

Let's try the second possibility.

Take the square root of both sides.

9 - h = sqrt(0)

Add h to both sides

9 - h = 0  

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So now what we have is

y = a(x - 9)

Use the first equation to get a

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-7 = a(3)

-7/3 = a

Answer

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