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ludmilkaskok [199]
3 years ago
13

A customer pay 18 for a DVD that originally cost 20. What is the percent decrease in the cost of the DVD

Mathematics
1 answer:
natima [27]3 years ago
8 0

The discount is $2. 2/20 is 0.1 or 1/10 which as a percentage would be 10%. The discount of $2 is <u><em>10%</em></u> off.

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Juli2301 [7.4K]

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Can someone help me with this!
Stolb23 [73]

Answer:

  2.  x = 18

  3.  x = 7

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Step-by-step explanation:

The simple rules involved here are ...

  • the sum of angles of a triangle is 180°
  • angles forming a linear pair are supplementary (total 180°).

Together, these tell you that the external angle of a triangle has the same measure as the sum of the opposite internal angles. (The third angle is the supplement of the external angle.)

<u>Problem 1</u>

Work shown is correct.

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<u>Problem 2</u>

Using the above observation, ...

  (5x -11)° + (2x +20°) = (11x -63)°

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<u>Problem 3</u>

The angles of an equilateral triangle are 60°, so that is the measure of the marked angle.

  9x -3 = 60

  9x = 63 . . . . . . add 3

  x = 7 . . . . . . . . .divide by 9

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  base angle = 90° -(1/2)(apex angle) . . . . .solve for base angle

Filling in the given apex angle value, we get ...

  base angle = 90° -(1/2)(34°) = 73°

Both missing angles are 73°.

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What is the answer<br><br> 10 x 57
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Answer:

570 Mr.Monkay :D

Step-by-step explanation:

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