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3 years ago

What is 5ax + c = 8.5?

Mathematics

2 answers:

Ulleksa [173]3 years ago

7 0

Step-by-step explanation:

5ax + c = 8.5

5ax=8.5-c

x= (8.5-c)/5a

lara31 [8.8K]3 years ago

3 0

Answer:

the answer of this question is i dont know

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Solve the following word problem. A man travels from Town X to Town Y at an average rate of 50 mph and returns at an average rat

777dan777 [17]

Distance = rate*time

Let distance from X to Y be 'd'

From the equation we can solve for 'time'

time = distance/rate

The total time it takes to go 50 mph ,then 40 mph is:

$\frac{d}{50} + \frac{d}{40}$

The total time it takes to go 45 mph round trip is:

$\frac{2d}{45}$

We know that the round-trip at 45 mph takes half-hour shorter, so by adding '1/2' to its time it will be equal to the time to go 50 then 40.

$\frac{2d}{45} + \frac{1}{2} = \frac{d}{50} + \frac{d}{40} \\ \\ \frac{4d+45}{90} = \frac{9d}{200} \\ \\ 800d+9000 = 810d \\ \\ 10d = 9000 \\ \\ d = 900$

Answer: The distance from X to Y is 900 miles.

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3 years ago

What is 1 1/4 + ( 3 2/3 + 5 3/4)?

frez [133]

The answer is 4 1/12

1 1/4 = 15/12

3 2/3 = 44/12

5 3/4 = 69/12

So, together they are 128/12 =10 8/12 = 10 2/3

I hope this helps

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3 years ago

Solve this equation:<br><br><br><br> Six more than nine times a number ( variable) is 456

ch4aika [34]

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3 years ago

What year is 7 years after 2003

mezya [45]

Answer:

2010

Step-by-step explanation:

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3 years ago

Read 2 more answers

Considering the number of questions incorrect from classmates on a quiz {10, 11, 12, 13, 13, 13, 14, 15, 16, 16, 17, 18, 18, 19,

IrinaK [193]

Answer:

According to the Empirical Rule, 68% of the data should fall between 11.98 and 18.02

Step-by-step explanation:

We are given the following data in the question:

10, 11, 12, 13, 13, 13, 14, 15, 16, 16, 17, 18, 18, 19, 20

Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{225}{15} = 15$

Sum of squares of differences = 25 + 16 + 9 + 4 + 4+ 4 + 1 + 0+ 1+ 1 + 4 + 9 + 9+ 16 + 25 = 128

$S.D = \sqrt{\dfrac{128}{14}} = 3.02$

Empirical rule:

According to this rule almost all the data lies within three standard deviation of the mean for a normal distribution.
About 68% of data lies within one standard deviation of the mean.
About 95% of data lies within two standard deviations of mean.
Arround 99.7% of data lies within three standard deviation of mean.

Thus, by empirical rule,

$\mu \pm 1\sigma = 15\pm (3.02) = (11.98,18.02)$

According to the Empirical Rule, 68% of the data should fall between 11.98 and 18.02

5 0

3 years ago