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sukhopar [10]
3 years ago
7

It costs $0.60 to run a fan for 4 hours. How much does it cost to run the fan for 6 hours?

Mathematics
1 answer:
spin [16.1K]3 years ago
5 0

Answer:

0.90$

Step-by-step explanation:

4hour=0.60

6hour=x

x=(0.60×6)/4

x=0.90$

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otez555 [7]

c = 3p + 7
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6 0
4 years ago
Write the equation<br> (0,5)<br> (2.0)
deff fn [24]
The answer will be y=-5/2x+5
6 0
3 years ago
What is the standard deviation of the data set? Round to the nearest tenth if needed. 2, 4, 7, 8, 9
barxatty [35]

Hiiiiiiii, okay here's the full- explanation for you, so here's the final answer. The explanation of how i got the answer is also below! Hope this helped you!!

Answer:

2.9

Step-by-step explanation:

First the mean or average = sum / data points (or N) = (2 + 4 + 7 + 8 + 9) / 5 = 6  

Now we take each of the individual values subtract the mean, and then square them, and add it all up.  

(2 - 6)^2 + (4 - 6)^2 + (7 - 6)^2 + (8 - 6)^2 + (9 - 6)^2 = 34  

Then we divide this by degrees of freedom = N - 1 to find the sample standard deviation. Note that this is different from the population standard deviation, where we would just divide N, but we use this because our data set is small, like less than 30 points.  

34 / (N - 1) -----> = 34 / (5 - 1) = 8.5  

Now, this is the variance, so we take the square root of the variance to get the sample standard deviation:  

√(8.5) = 2.9 (rounded to 1 decimal place)  

Note that scientific calculators, even my $20 version can do these kind of statistics calculations. Just enter the data set as a table of values in statistics mode, and press a few buttons, you're done!

6 0
4 years ago
Antoine has a carnival booth at the school fair where students randomly select a ping pong ball from a can. He wants to place 5
nevsk [136]

Answer:

(a)5n=3n+15

(b)n=7.5

Solution is not viable

Step-by-step explanation:

(a)

Total number of red ping pong balls=5

Total number of red ping pong balls=n

Now, probability of an event =\frac{Number of favourable events}{Total number of events}

Then, theprobability of randomly choosing a blue ping pong ball is

=\frac{n}{n+5}

Given that this probability is=\frac{3}{5}

Thus, we have that,

\frac{n}{n+5}= \frac{3}{5}\\ 5n=3(n+5)\\5n=3n+15

(b)

Solving, the above equation,

5n=3n+15\\2n=15\\n=7.5

This solution is not viable as, number of ping pong ball must be an integer and not a decimal number.

7 0
3 years ago
1) Does the following graph show a function?
Andrei [34K]
No it does not for it to show function it has to go straight up and down or side to side
4 0
3 years ago
Read 2 more answers
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