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4 years ago

Solve the equation by finding square roots 9x^2-12x+4=-3

Mathematics

1 answer:

Dmitry [639]4 years ago

6 0

square root of 3, √3

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50 students in 4 buses how many in each bus

12345 [234]

50 divided by 4 is 12.5 so there is about 12 or 13 students on each bus.

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4 years ago

Read 2 more answers

The graph below shows the distances, in miles, that a dragonfly can travel in a certain number of hours:

PolarNik [594]

Answer:

The second option

Step-by-step explanation:

The dependent variable is distance, the equation is y = 20x, and the dragonfly will travel 480 miles

7 0

3 years ago

The city of Madison regularly checks the quality of water at swimming beaches located on area lakes. Fifteen times the concentra

Maksim231197 [3]

Answer:

The sample standard deviation is 393.99

Step-by-step explanation:

The standard deviation of a sample can be calculated using the following formula:

$s=\sqrt[ ]{\frac{1}{N-1} \sum_{i=1}^{N}(x_{i}-{\displaystyle \textstyle {\bar {x}}}) ^{2} }$

Where:

$s=$ Sample standart deviation

$N=$ Number of observations in the sample

${\displaystyle \textstyle {\bar {x}}}=$ Mean value of the sample

and $\sum_{i=1}^{N}(x_{i}-{\displaystyle \textstyle {\bar {x}}}) ^{2} }$ simbolizes the addition of the square of the difference between each observation and the mean value of the sample.

Let's start calculating the mean value:

$\bar {x}=\frac{1}{N} \sum_{i=1}^{N}x_{i}$

$\bar {x}=\frac{1}{15}*(180+1600+90+140+50+260+400+90+380+110+10+60+20+340+80)$

$\bar {x}=\frac{1}{15}*(3810)$

$\bar {x}=254$

Now, let's calculate the summation:

$\sum_{i=1}^{N}(x_{i}-\bar {x}) ^{2} }=(180-254)^2+(1600-254)^2+(90-254)^2+...+(80-254)^2$

$\sum_{i=1}^{N}(x_{i}-\bar {x}) ^{2} }=2173160$

So, now we can calculate the standart deviation:

$s=\sqrt[ ]{\frac{1}{N-1} \sum_{i=1}^{N}(x_{i}-{\displaystyle \textstyle {\bar {x}}}) ^{2} }$

$s=\sqrt[ ]{\frac{1}{15-1}*(2173160)}$

$s=\sqrt[ ]{\frac{2173160}{14}}$

$s=393.99$

The sample standard deviation is 393.99

3 0

4 years ago

Pls help me its only 2 questions

insens350 [35]

I’m it’s 6647888383864

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3 years ago

How do you find the missing height of a trapezoid

IRISSAK [1]

A=1/3h(b1-b2). So h=3/(b1-b2)

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3 years ago