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svetlana [45]
3 years ago
12

Solve for the base. Round to hundredths when necessary.

Mathematics
1 answer:
Elena-2011 [213]3 years ago
6 0

Answer:

  1. 2730.54
  2. 18.8%
  3. 62.5% (decrease)

Step-by-step explanation:

The applicable formula is ...

  rate = portion/base

so ...

  base = portion/rate

Of course, a percentage is a fraction that has been multiplied by 100%.

__

1. base = portion/rate = 456/0.167 ≈ 2730.54

The base is about 2730.54.

__

2. rate = portion/base = 50/266 ≈ 0.18797 ≈ 18.8%

The rate is about 18.8%.

__

3. The decrease can be figured from ...

  rate of change = (new amount)/(original) -1 = 33/88 -1

     = -5/8 = -0.625 = -62.5%

The rate of decrease is 62.5%.

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Answers:
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Explanation:
Part (a): getting angle x:
In triangle BED, we have:
measure angle BED = 90°
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Therefore:
measure angle DBE = 180 - (90+50) = 40°
Now, we have angle DBE and angle GBF vertically opposite angles.
This means that they are both equal. Therefore angle GBF = 40°
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Part (b): getting angle y:
We know that the sum of measures of angles on a straight line is 180.
This means that:
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We have:
angle GBF = 40°
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angle CBE = y
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40 + 105 + y = 180
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Part (c): getting angle z:
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measure angle BEC = 90°
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Therefore:
z + 90 + 35 = 180
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