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blsea [12.9K]
4 years ago
8

What is the value of (-7 + 3) - (2 - 6)?

Mathematics
1 answer:
serious [3.7K]4 years ago
7 0

Answer:

0

Step-by-step explanation:

(-7 + 3) - (2 - 6)

PEMDAS

Parentheses first

(-4) - (-4)

Subtracting a negative is adding

-4 +4

0

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Bailey has an hour to get ready for school. She spends 3/6 of the time getting dressed. She spends 1/4 of that time eating break
Katen [24]
Well, to find out whether she spent more time getting dressed or eating breakfast, we simply have to compare the fractions of the hour that she took on each.
We know that she took 3/6 of an hour to get dressed and 1/4 of an hour to eat breakfast. To find out which activity she spent more time on, we simply need to see which fraction is bigger.
To do this, we must first reduce the fractions to lowest terms. 1/4 is already in lowest terms, so we can leave that alone. 3/6 can be reduced, however, and since 3 goes into 6 twice, it reduces to 1/2.
Now, we can compare the fractions.
Is 1/2 of an hour or 1/4 of an hour more?
The answer is 1/2, so now we know that Bailey spent more time getting dressed than eating breakfast.
Hope that helped! =)
6 0
3 years ago
The times of the runners in a marathon are normally distributed, with a mean of 3 hours and 50 minutes and a standard deviation
serious [3.7K]

The probability that a randomly selected runner has a time less than or equal to 3 hours and 20 minutes is 0.16 or 16%.

<h3>What is normally distributed data?</h3>

Normally distributed data is the distribution of probability which is symmetric about the mean.

The mean of the data is the average value of the given data.

The standard deviation of the data is the half of the difference of the highest value and mean of the data set.

The times of the runners in a marathon are normally distributed, with

  • Mean of 3 hours and 50 minutes
  • Standard deviation of 30 minutes.

Refere the probabiliity table attached below. The probability of Z being inside the 1 Standard daviation of mean is 0.84.

The probability of runner selected with time less than or equal to 3 hours and 20 minutes,

P=1-0.84\\P=0.16

Thus, the probability that a randomly selected runner has a time less than or equal to 3 hours and 20 minutes is 0.16 or 16%.

Learn more about the normally distributed data here;

brainly.com/question/6587992

4 0
2 years ago
Alex's mom gave her $27.75 to spend on smoothies for the entire month.How many smoothies can she buy during the month.​
Komok [63]

Answer:

Around 6 smoothies

Step-by-step explanation:

1 smoothie = $4.25

? smoothies = $27.75

27.75 divided by 4.25 = 6.52941176470....

So like 6 smoothies with some spare change

5 0
3 years ago
What is the value of x? 5/6x - 3 - 1/2x = -9
Natalka [10]
X=-36

5/6x-1/2x=1/3x
1/3x-3=-9
1/3x=-12
x=-36
4 0
3 years ago
Can we find solution to a problem without conducting systematic research?
marin [14]
Every problem in the universe must have a mathemathics compositition in it.If not then you are just guessing or predicting 

6 0
3 years ago
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