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3 years ago

Briefly explain the purpose of the fecl3 test. what does a positive fecl3 test signify

1 answer:

4 0

<span>FeCl3 test is used to find out the phenols in a sample or compound. Natural phenols in a plant extract can be determined using the FeCl3 test, for example. If the test results in dark brown solution it is a positive result signify that it contains phenols.</span>

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the population of collin county, which follows the exponential growth model, increased from 491,675 in 2000 to 782,341 in 2010.

CaHeK987 [17]

Applying the formula for the exponential growth model, the growth rate is 0.046447277776453351798354258063923

the exponential growth is a data pattern that illustrates an increase over time by generating an exponential function curve.

The exponential growth model can be expressed as:

P(t) = P(0) x e^(k.t)

Where:

P(t) = Value at time t

P(0) = Initial value

k = growth rate

Information from the problem:

P(0) = 491,675

P(t) = 782,341

t = 2010 - 2000 = 10 years

Substitute the data into the formula:

782,341 = 491,675 x e^{10k}

e^{10k} = 782,341 / 491,675

10 k . ln e = ln (782,341 / 491,675)

10 k = 0.46447277776453351798354258063923

k = 0.046447277776453351798354258063923

Read more about the exponential growth model here:

brainly.com/question/14973088

#SPJ4

8 0

1 year ago

The equation for a line passing through (-4, 6) and (1, 0) could be written in slope-intercept form as:

aleksandr82 [10.1K]

Answer: b. Y= -6/5x + 6/5

First find the slope of your two points, then write your equation in point-slope form. Using your equation in point-slope form, you can solve and convert it to slope-intercept form.

7 0

3 years ago

I need help me please!!!

ExtremeBDS [4]

The slope for number one would be negative 3 i think

3 0

3 years ago

Rewrite the system of linear equations as a matrix equation AX = B.

iren2701 [21]

Answer:

$\left[\begin{array}{ccc}1&2&5\\1&1&1\\4&6&5\end{array}\right]*\left[\begin{array}{ccc}x1\\x2\\x3\end{array}\right]=\left[\begin{array}{ccc}5\\6\\7\end{array}\right]$

Step-by-step explanation:

Let's find the answer.

Because we have 3 equations and 3 variables (x1, x2, x3) a 3x3 matrix (A) can be constructed by using their respectively coefficients.

Equations:

Eq. 1 : x1 + 2x2 + 5x3 = 5

Eq. 2 : x1 + x2 + x3 = 6

E1. 3 : 4x1 + 6x2 + 5x3 = 7

Coefficients for x1 ; x2 ; x3

From eq. 1 : 1 ; 2 ; 5

From eq. 2 : 1 ; 1 ; 1

From eq. 3 : 4 ; 6 ; 5

So matrix A is:

$\left[\begin{array}{ccc}1&2&5\\1&1&1\\4&6&5\end{array}\right]$

And the vector of vriables (X) is:

$\left[\begin{array}{ccc}x1\\x2\\x3\end{array}\right]$

Now we can find the resulting vector (B) using the 'resulting values' from each equation:

$\left[\begin{array}{ccc}5\\6\\7\end{array}\right]$

In conclusion, AX=B is:

$\left[\begin{array}{ccc}1&2&5\\1&1&1\\4&6&5\end{array}\right]*\left[\begin{array}{ccc}x1\\x2\\x3\end{array}\right]=\left[\begin{array}{ccc}5\\6\\7\end{array}\right]$

7 0

4 years ago

There are 28 students in a class. the teacher separates them into 7 equal groups. which equation can be used to find s, the numb

Lemur [1.5K]

S = total # of students / #of students in each group
So you can do, s= t/g
Overall, the answer is 4 students per group

3 0

3 years ago