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quester [9]
4 years ago
12

Five sisters - Alexandra, Emily, Lisa, Martha, and Laura decide to purchase a big screen TV as a birthday gift for their mother.

- Martha agrees to pay 20% of the cost -Emily gives $75 -Alexandra pays 25% of the cost -Laura gives $75 - Lisa contributes one-half of the cost. What is the total cost of the big screen Tv? What amount will each sister pay?
Mathematics
1 answer:
Ilia_Sergeevich [38]4 years ago
8 0

Answer:

  • Total cost: $3000
  • Martha: $600
  • Emily: $75
  • Alexandra: $750
  • Laura: $75
  • Lisa: $1500

Step-by-step explanation:

The percentages add to 95%, so the dollar amounts (total $150) comprise 5% of the cost. Then the total cost is ...

  total cost × 5% = $150

  total cost = $150/0.05 = $3000

And the percentages are ...

  20% × $3000 = $600 (Martha's share)

  25% × $3000 = $750 (Alexandra's share)

  50% × $3000 = $1500 (Lisa's share)

_____

<em>Check</em>

$600 + 75 + 750 + 75 + 1500 = $3000 . . . as it should

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The ratio of oranges to apples in Helen's basket is 4:3. The basket has 12 apples in it. How many oranges are in the basket?
frez [133]

Answer:

16 oranges

Step-by-step explanation:

The ratio of oranges to apples is 4:3 which means that for every four oranges, there are 3 apples.

Since there are 12 apples in the basket, to find the number of oranges, set up a ratio.

4/3 = x/12 (x represents the number of oranges)

Cross multiply.

48 = 3x

Divide by 3.

x = 16

There are 16 oranges in the basket.

Hope that helps.

3 0
3 years ago
A scientist measures a substance to be 0.8 grams. Calculate the percent of error in the measurement. Show all work for full cred
Volgvan
You'll need to give a bit more information for the question to be answered. You can only calculate the percentage of error if you know what the mass of the substance *should be* and what you've *measured* it to be.

In other words, if a substance has a mass of 0.55 grams and you measure it to be 0.80 grams, then the percent of error would be:

percent of error = { | measured value - actual value | / actual value } x 100%

So, in this case:

percent of error = { | 0.80 - 0.55 | / 0.55 } x 100%
percent of error = { | 0.25 | / 0.55 } x 100%
percent of error = 0.4545 x 100%
percent of error = 45.45%

So, in order to calculate the percent of error, you'll need to know what these two measurements are. Once you know these, plug them into the formula above and you should be all set!
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zubka84 [21]

Step-by-step explanation:  use a histograph

4 0
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Flour type                   z                      Mean                            StDev

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15% DBS                     00                      485                                  24

Answer:

5. ANOVA for several means

Step-by-step explanation:

In this question, three different means of the data are compared. ANOVA is used for comparing between two or more means to test for differences. It extends the z and t test that are only used for comparing two means.

Since three means are compared, the inference procedure to be used is ANOVA.

5 0
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cestrela7 [59]

Answer:6.25

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