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algol [13]
3 years ago
6

I needed help on this

Mathematics
1 answer:
Strike441 [17]3 years ago
5 0

Answer:

Step-by-step explanation:

Let Freda's sum = x

Donnie has 3/4 x

He spends 63 dollars. His sum is now

3/4x - 63

Now the equation looks like this

6(3/4x - 63) = x            Remove the brackets

6*3/4 x - 378 =x

6 * 3/4 = 4 1/2

4 1/2 x - 378 = x           Add 378 to both sides

4 1/2 x = x + 378          Subtract x from both sides

3.5 x = 378                  Divide by 3.5

x = 378 /3.5

x = 108

Since x = 108, that's how much Freda had. (She spent nothing).

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Since the Boston marathon began in 1897, the finish time has been incrementally decreasing. The mean finish time to date is 231
morpeh [17]

Answer:

hello your question lacks the required options but i will provide a general answer to your question

answer : The mean value  and the standard deviation would allow us use a Z-score

Step-by-step explanation:

mean value = 231 minutes

standard deviation ( std ) = 40 minutes

sample size = 40

The parameters that would be applicable while use Z-score are : The given mean value and the standard deviation

This is because the value of a z-score gives us an information on how far we are from the mean score i.e. number of standard deviations

+Zscore means that the score  is above the average value

-Zscore means that the score is below the average value

7 0
3 years ago
(2)/(7):0.6x=(4)/(21):0.25
inysia [295]

Answer:

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Unless you meant to clarify what in the equation you needed, but that is the answer to it.

7 0
3 years ago
4. The Eisenhower Tunnel in Colorado was completed in 1973 and is the
Mrac [35]

Answer:

about 60 miles(97 km) west of denver Colorado..i think this is helpful.

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OlgaM077 [116]

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How many inches are in 4 1/2 feet ?
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Answer:

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(self-explanatory.)

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