Answer:
Step-by-step explanation:
Rf values (retention factor values) are used in thin layer chromatography (TLC) to measure the separation of components in a mixture. They are calculated as follows:
Rf = (distance traveled by the solute) / (distance traveled by the solvent)
The distance traveled by the solute is measured from the origin (the spot where the sample was applied) to the final position of the solute on the TLC plate. The distance traveled by the solvent is measured from the origin to the solvent front (the point where the solvent stops moving up the plate).
It is important to note that Rf values are unique to each solute and are dependent on the solvent used, the type of TLC plate, and the conditions of the experiment (such as the temperature and humidity). To ensure accurate comparison of Rf values, it is necessary to standardize the conditions of the experiment.
Calculating Rf values is a crucial step in the interpretation of TLC data, as it allows for the identification of the components of a mixture based on the unique Rf values of each solute.
A group of students was surveyed in a middle school class. They were asked how many hours they work on math homework each week. The results from the survey were recorded.
Number of hours Total number of students
0 1
1 3
2 2
3 5
4 9
5 7
6 3
Determine the probability that a student studied for 1 hour.
1.0
0.9
0.3
0.1
hellppppppp ASAP
The probability that a student studied for 1 hour will be 0.10. Then the correct option is D.
What is probability?Its fundamental concept is that someone will nearly surely occur. The proportion of positive events in comparison to the total of occurrences.
Then the probability is given as,
P = (Favorable event) / (Total event)
The table is given below.
Number of hours Total number of students
0 1
1 3
2 2
3 5
4 9
5 7
6 3
The total number of students is given as,
Total = 1 + 3 + 2 + 5 + 9 + 7 + 3
Total = 30
Then the probability that a student studied for 1 hour is given as,
P = 3 / 30
P = 0.10
The probability that a student studied for 1 hour will be 0.10. Then the correct option is D.
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if a residual is negative, then that data point lies _________________ the regression line.
A residual is the difference between an observed value and the predicted value from a regression line.
A negative residual indicates that the observed value lies below the regression line. This can be expressed mathematically using the formula [tex]y = mx + b[/tex], where y is the observed value, m is the slope, x is the independent value, and b is the y-intercept of the line.
For example, if the observed value is y = 3, the predicted value is y = 5, and the slope and intercept of the line are m = 2 and b = 1, respectively, then the residual can be calculated as [tex]y = 3 - (2*1 + 1) = -1.[/tex] Since the residual is negative, this indicates that the observed value lies below the regression line.
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You want to deliver a package to Japan. The FedEx delivery service charges a $10 flat fee plus $2 per pound. You can also use the USPS Priority Mail service which charges a $2 flat fee plus $4 per pound.
Write an equation for the cost for FedEx to send the package.
Use x as the number of pounds and use y as the total cost.
The cost function for FedEx delivery is -
C{x} = 2x + 10
What are algebraic expressions?In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context.Given is that you want to deliver a package to Japan. The FedEx delivery service charges a $10 flat fee plus $2 per pound. You can also use the USPS Priority Mail service which charges a $2 flat fee plus $4 per pound.
For the FedEx delivery, we can write the cost function as -
C{x} = 2x + 10
Therefore, the cost function for FedEx delivery is -
C{x} = 2x + 10.
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1. A solid metal cuboid has a volume of 600cm3.
(a) The base of the cuboid is 10cm by 12cm. Calculate the height of the cuboid.
(b) The solid metal cuboid is melted and made into 1120 spheres, each with radius 0.45cm. Find the volume of metal not used in making these spheres.
Answer:
(a) The height of the cubiod is 5cm.
(b) The volume of metal not used in making these spheres is 172cm^3.
Step-by-step explanation:
(a) 12*10= 120
600/120= 5cm
(b) volume of 1120 spheres= (4/3*π*0.45^3)(1120)
= 428cm^3 (to 3 s.f.)
600-428= 172cm^3
You pick a card at random.
1 2 3 4
What is P(factor of 10)?
Write your answer as a fraction or whole number.
The probability of picking a factor of 10 is 1/4 or 0.25 as a decimal.
What is probability?Probability can be defined as the ratio of favorable outcomes to the total number of events.
Here,
To calculate the probability of picking a factor of 10, we need to count the number of cards that are factors of 10 and divide that by the total number of cards.
The factors of 10 are 1, 2, 5, and 10. Out of the given cards, only 2 is a factor of 10.
Therefore, the probability of picking a factor of 10 is 1/4 or 0.25 as a decimal.
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How many inches are there in 150 meters?
1 m≈39.37 in.
Responses
3.8 in.
3.8 in.
1554.1 in.
1554.1 in.
4355.5 in.
4355.5 in.
5905.5 in.
5905.5 in.
Question in the picture.
The domain and range of the function for the given graph is -
Domain : (-∞, + ∞)Range: [3, ∞)Define the term domain and range of the function?The range of values which we're permitted to enter into our function is known also as domain of a function.
The x values for a function like f make up this set (x). A function's range is the collection of values it can take as input. After we enter an x value, the function outputs this sequence of values.The collection of all potential inputs for a function is its domain.The collection of potential output values for a function is known as its range. For instance, the range seems to be the non-negative real numbers for the function f(x)=x2 here on domain among all real numbers (xR), which may be represented as f(x)≥0 (or [0,∞) using interval notation).Thus, the domain and range of the function for the given graph is -
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The result of a number, when decreased by 66 2/3%, is 432. Find the number
Answer:
1298/3 is the answer
Step-by-step explanation:
Answer:
1296
Step-by-step explanation:
Let the unknown number be x.
If 432 is the result of x being decreased by 66²/₃%, then 432 is 33¹/₃% of x since 100% - 66²/₃% = 33¹/₃%.
Therefore:
[tex]\implies 33\frac{1}{3}\%\;\textsf{of}\;x=432[/tex]
[tex]\implies \dfrac{33\frac{1}{3}}{100} \cdot x=432[/tex]
[tex]\implies \dfrac{33\frac{1}{3}x}{100} =432[/tex]
Multiply both sides of the equation by 100:
[tex]\implies 33\frac{1}{3}x =43200[/tex]
Rewrite 33¹/₃ as an improper fraction:
[tex]\implies \dfrac{100}{3}x =43200[/tex]
Multiply both sides by 3:
[tex]\implies 100x=129600[/tex]
Divide both sides by 100:
[tex]\implies x=1296[/tex]
Therefore, the number that when decreased by 66²/₃% is 432, is 1296.
Male and female high school students reported how many hours they worked each week in
summer jobs. The data is represented in the following box plots.
0
Males
Females
4.
10
20
30
40
50
Identify any values of data that might affect the statistical measures of spread and center. (1
point)
The value of data that might affect the statistical measures of spread and center is B. There is a high data value that causes the data set to be asymmetrical for the males.
How can spread and center be affected ?Outliers stretch out the data further, resulting in a wider range and a higher standard deviation. On the other hand, eliminating outliers reduces data spread, resulting in a lower range and standard deviation.
When an outlier is present, it might change the way the graph looks since it raises the mean. From the chart, there is a high data value in the males which will therefore make the data to be asymmetrical for the males as the larger spread for the males means the data set tilts towards them.
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How many milliliter in 1 microliter?
From the given information provided, by converting the units there are 0.001 milliliters in 1 microliter.
This means that if you have 1 microliter of liquid, it is equal to 0.001 milliliters of liquid.
The conversion factor between milliliters (mL) and microliters (μL) is:
1 mL = 1000 μL
Therefore, to convert microliters to milliliters, you divide the number of microliters by 1000.
For example, if you have 500 μL of liquid, you can convert it to milliliters by dividing 500 by 1000:
500 μL / 1000 = 0.5 mL
So, 500 microliters of liquid is equal to 0.5 milliliters of liquid.
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Find the measure of the indicated angle in each triangle?
The measure of ∠U= 80°, ∠B=44°, ∠Q= 93° respectively which indicates the angle of each triangle.
First take the Triangle TUV:
⇒∠T+∠U+∠V=180°
⇒37°+∠U+63°=180°
⇒∠U+100°=180°
⇒∠U=80°
Now, take triangle ABC:
⇒∠A+∠B+∠C=180°
⇒46°+∠B+90°=180°
⇒∠B+136°=180°
⇒∠B=44°
Finally take triangle PQR:
⇒∠P+∠Q+∠R=180°
⇒51°+∠Q+36°=180°
⇒∠Q+87°=180°
⇒∠Q=93°
Therefore, measure of the indicated angle in each triangle are 80°, 44 and 93° respectively.
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Consider the equation pT=kVN, where k is a constant. Select all of the correct
answers that describe the variation between variables.
p varies [inversely or directly]with V
N varies [inversely or directly]with V
p varies [ inversely or directly]With T
T varies [ inversely or directly] with N
The correct answer is P and T directly varies with V and N, and P and N inversely varies with T and V respectively.
What is direct variation?It is the mathematical relationship between two variables which can be expressed by an equation in which one variable is equal to a constant times the other.
Given that, the equation pT = kVN, where k is a constant.
pT = kVN
If we remove constant, then,
pT ∝ VN
or
p 1/∝ T
V 1/∝ N
Hence, the correct answer is P and T directly varies with V and N, and P and N inversely varies with T and V respectively.
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Múltiples that are shared by two or more numbers are
Answer:
common multiples
Step-by-step explanation:
HELP ASAP !!!!!!!PLEASE
Due to the fact that they are both increased to the same power, the two functions are exponential. Both functions have distinct constants and rates.
What is a function?A unit of code known as a function carries out a particular task. A function in mathematics is a relationship between a set of allowable inputs and outputs, having the condition that each input is connected to exactly one output.
As illustrated in the graphic that represents the posed question, the two functions that we are considering are all such that we can see that they are exponential in nature.
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4) If (6,4) and (3 ,m) are two perpendicular vectors, then m =
Answer:
Step-by-step explanation:
If two vectors are perpendicular to each other then their scalar(dot) product must be zero.
Therefore,
A
.
B
=0
(2
i
^
+2
j
^
+3
k
^
)⋅(3
i
^
+6
j
^
+n
k
^
)=0
6+12+3n=0
3n=−18
n=−6
Based on the t-test assuming equal variances on the T-Test Equal worksheet, is it reasonable to assume that the variances are equal? O Examining the ratio of the variances, it is reasonable to conclude that the variances are unequal. O Whether the variances are equal or not is not relevant for this situation.O Examining the ratio of the variances, it is reasonable to conclude that the variances are equal. O It is impossible to determine if the variances are equal given the data we have.
Based on the t-test assuming equal variances "Examining the ratio of the variances, it is reasonable to conclude that the variances are unequal."
When conducting a t-test assuming equal variances, it is necessary to determine whether or not the variances of the two groups being compared are actually equal. This is important because the calculation of the t-statistic depends on the assumption of equal variances.
To assess the assumption of equal variances, one can examine the ratio of the variances of the two groups. Typically, if the ratio of the variances is greater than 2 or less than 1/2, then it is reasonable to conclude that the variances are unequal. In the absence of such evidence, one can assume that the variances are equal.
Therefore, it is not reasonable to assume that the variances are equal.
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20,−10,5,___ what comes next
The next term is -25.
What is the number pattern?A number pattern is a pattern in a series of numbers that represents the common relationship between the numbers. In Maths, number patterns are the patterns in which a list number that follows a certain sequence. usaually, the patterns establish the relationship between two numbers. It is known as the sequences of series in numbers.
Given;
The pattern20,−10,5,___
Here, first term is 20, second is -10
Difference=20+10
=30
Now,
=5-30
=-25
Therefore, the answer of the given pattern will be -25.
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Use technology to find points and then graph the function y = log₂ (x − 1) — 5,
following the instructions below.
done plotting points
Plot at least four points that fit on the axes below. Click a point to delete it.
10 9 8
10
8
N
9
4
3
10
The (x,y) coordinate points of the logarithmic function are as follows. (2, -5), (3, -4), (5, -3), (9, -2), (1, - 10).
The graph of a logarithmic function
The exponential function is thought of as the inverse of the logarithmic function because of its close relationship. The logarithmic function logaN = x is derived from the exponential function ax = N.
When seen as an exponential form, the logarithm of any integer N is the exponent to which the base of the logarithm needs to be raised in order to reach the value of N.
The fundamental logarithmic function has the notation f(x) = log_ax(r) y = log_a(x), where a > 0. Natural logarithm (ln) and common logarithm are examples of log functions (log).
From the given information, the logarithmic function y = log₂ (x − 1)- 5 is plotted on the graph and the following x,y points are obtained.
(x, y)(2, -5), (3, -4), (5, -3), (9, -2), (1, - 10).Learn more about the graph of a logarithmic function.
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what is the solution to the system
line 1: y= -2x-4
line 2: y=2/5x + 16/5
The solution of system of equation y= -2x-4 and y=2/5x + 16/5 is (-3, 2).
What is Equation?Two or more expressions with an Equal sign is called as Equation.
The system of equations are y= -2x-4
and y=2/5x + 16/5
By substitution method let us find the solution.
2/5x + 16/5=-2x-4
2/5x+2x=-4-16/5
12x/5=-20-16/5
12x=-36
Divide both sides by 12
x=-3
Now plug in x value in any of the equation
y=-2(-3)-4
y=6-4
y=2
Hence, the solution of system of equation y= -2x-4 and y=2/5x + 16/5 is (-3, 2).
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What is the equation of the line that passes through the point (5,0) and has a slope of 6/5?
The solution is, the equation of the line that passes through the point (5,0) and has a slope of 6/5 is , y=6/5*x - 6
What is a straight line?A straight line is an endless one-dimensional figure that has no width. It is a combination of endless points joined both sides of a point and has no curve.
here, we have,
the line that passes through the point (5,0) and has a slope of 6/5
now, w know, the point slope form of straight line is,
y-y1=m(x-x1)
so, putting the values , we get,
y-0=6/5(x-(5))
y-0=6/5(x-5)
y=6/5*x- 30/5
y=6/5*x- 6
Hence, The solution is, the equation of the line that passes through the point (5,0) and has a slope of 6/5 is , y=6/5*x - 6
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What is the price of a mobile whose market price is Rs 15,000 and 13% VAT was levied after allowing 20% discount on it?
The cell phone costs Rs 13,560 after a 20% discount and 13% VAT are applied.
Market price and discount.First, we need to calculate the discount amount given on the market price of the mobile phone:
Discount = 20% of the market price
Discount = 0.20 x 15000
Discount = 3000
So, the discounted price of the mobile phone is:
Discounted Price = Market Price - Discount
Discounted Price = 15000 - 3000
Discounted Price = 12000
Now, we need to add the VAT amount to the discounted price:
VAT = 13% of the discounted price
VAT = 0.13 x 12000
VAT = 1560
Therefore, the final price of the mobile phone, including the discount and VAT, is:
Final Price = Discounted Price + VAT
Final Price = 12000 + 1560
Final Price = 13560
So, the price of the mobile phone, after allowing a 20% discount and levying 13% VAT, is Rs 13,560.
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Help. This is 2 parts
Answer:can u take a picture that is a bit more closer
Step-by-step explanation:
please submit a closer picture
Is it possible to form a triangle with side lengths 3.5, 3.5, and 9? If so, will it be scalene, isosceles, or equilateral? A. Yes; scalene O B. Yes; isosceles O C. Yes; equilateral O D. No
No , it is not possible to form a triangle with side lengths 3.5, 3.5, and 9 , because of the rule that sum of any two sides must be greater than other side. So, Option D is correct.
A triangle is a two-dimensional shape formed by three line segments connecting three points. In order to form a triangle, a necessary and sufficient condition is that the sum of the lengths of any two sides must be greater than the length of the third side. This is known as the triangle inequality theorem.
If the sum of the lengths of any two sides is less than or equal to the length of the third side, then the three line segments will not be able to form a closed shape, and therefore cannot form a triangle.
In the case of the triangle with side lengths 3.5, 3.5, and 9, the sum of the lengths of the first two sides is 7, which is less than the length of the third side, 9. Hence, these three side lengths do not satisfy the triangle inequality theorem, and therefore cannot form a triangle.
In general, to determine the type of triangle that can be formed with three given side lengths, it is necessary to compare the lengths of the sides and check if any two sides are equal in length (isosceles), or if all three sides are equal in length (equilateral). If none of the sides are equal, then the triangle is called scalene.
In this case, since it is not possible to form a triangle with the given side lengths, it is not possible to determine the type of triangle that would be formed.
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expression by 1 2 +1 3 || + −1+ 4 + rewrite the expression by adding the whole numbers first
The value of the expression is 28.
What is an expression?An expression contains more than two variables or numbers with addition, subtraction, multiplication, and division.
Example: 4.4 + 3x + 9.9y = 7 is an expression.
We have,
12 + 13 + -1 + 4
All the terms are whole numbers.
= 25 + 4 - 1
= 29 - 1
= 28
Thus,
28 is the value.
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Solve each system by graphing
x-y=3
7x-y=-3
Use the triangles to answer the question. Triangle A B C with A B = square root of 13, B C = 2, A C = 3, and angle C is labeled as a right angle. Also shown is triangle D E F with E F = 4, D F = 6, and angle F is labeled as a right angle. © 2016 StrongMind. Created using GeoGebra. If △ABC∼△DEF, what is the scale factor for the dilation that maps △ABC to △DEF? Enter your answer as a number.
The scale factor for the dilation that maps △ABC to △DEF is 0.75.
What is triangle?A triangle is a geometric shape that consists of three line segments that connect to form three angles. These angles always add up to 180 degrees. A triangle has three sides and three vertices (corners). Triangles can have different shapes and sizes, and they are often classified based on the length of their sides or the size of their angles. Some common types of triangles include equilateral triangles (where all sides are equal in length and all angles are equal to 60 degrees), isosceles triangles (where two sides are equal in length), and right triangles (where one angle is a right angle, or 90 degrees). Triangles have many properties and are an important part of geometry and mathematics.
Here,
To determine the scale factor for the dilation that maps △ABC to △DEF, we need to find the ratio of the corresponding side lengths of the two triangles.
Since △ABC ∼ △DEF, we know that the corresponding angles of the two triangles are congruent. Therefore, angle B in △ABC corresponds to angle E in △DEF, and angle A in △ABC corresponds to angle D in △DEF.
Using the Pythagorean theorem, we can find the length of the missing side of △DEF:
DF² = DE² + EF²
6² =DE² + 4²
DE=√20
DE=2√5 units
3/4=2/2√5=√13/6=0.75
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a wildlife biologist is doing research on chronic wasting disease and its impact on the deer populations in northern colorado. to estimate the difference between the proportions of deer with chronic wasting disease in two different regions, a random sample of 200 deer was obtained from one region and a random sample of 197 deer was obtained from the other region. the biologist checked for the following.
The biologist was checking the condition for inference that (d) the observations within each sample are close to independent.
This is concluded from the fact that the biologist was checking if the product of sample size and the proportion of deer with chronic wasting disease in each sample was greater than or equal to 10. This is a commonly used rule of thumb to ensure that each sample has enough data to provide meaningful information about the population, and it is based on the idea that the sample size should be large enough such that the expected number of success (deer with chronic wasting disease) is at least 10 and the expected number of failures (deer without chronic wasting disease) is at least 10.
This helps to ensure that the observations within each sample are close to independent, as the sample proportions are unlikely to be greatly influenced by any individual deer in the sample.
Correct Question :
A wildlife biologist is doing research on chronic wasting disease and its impact on the deer populations in northern colorado. to estimate the difference between the proportions of deer with chronic wasting disease in two different regions, a random sample of 200 deer was obtained from one region and a random sample of 197 deer was obtained from the other region. the biologist checked for the following:
(200)(0.06)≥10
(200)(0.94)≥10
(197)(0.086)≥10
(197)(0.914)≥10
Which of the following conditions for inference was the biologist checking?
a. The population of deer within each region is approximately normal.
b. It is reasonable to generalize from the samples to the populations.
c. The samples are independent of each other.
d. The observations within each sample are close to independent.
e. The sampling distribution of the difference in sample proportions is approximately normal.
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Can someone help me answer this question??? LOL :)
For the exponential function:
g(x) = 14*(2)^x
We can see that:
a = 14, and b = 2.
How to identify the parts of the exponential function?A general exponential function is written as:
y = a*(b)^x
Where a is the inital value of the exponential function and b is the base.
Here we have the exponential function:
g(x) = 14*(2)^x
Comparing that to the general one, we can see that the initial value is 14 and the base is 2.
Then:
a = 14
b = 2
The correct option is the second one.
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Mrs. Gregory, the golf course superintendent at a country club, plans to reseed the putting green of the first hole. The circular putting green has a diameter of 38 ft.
People on golf course, aerial view.
What is the area of the putting green?
Use π=3.14.
Question 1 options:
------------------------
ANSWERS:
1133.54 ft²
119.32 ft²
1133 ft²
1314.14 ft²
Answer:
Step-by-step explanation: 1133.5.
Solve for lengths of the missing sides in each pair of similar triangles. Round to nearest tenth if if necessary jk kl
For the given similar triangles, the length of the missing side in the second triangle is 20.
To solve for the length of the missing side in the pair of similar triangles, we can use the SSS similarity theorem. The theorem states that 'if all three pairs of corresponding sides of two triangles are proportional, then the two triangles are similar'. Since the triangles are similar, the ratio of their corresponding sides will be equal.
The given measurements of the first triangle are 12, 18, and 24, and the measurements of the second triangle are 10, 15, and x. To solve for x, you can use the ratio of corresponding sides of similar triangles. The ratio for the sides of the first triangle are 12:18:24 and for the second triangle are 10:15:x. The ratio of the corresponding sides is 10:12, 15:18, and x:24.
We can set up a proportion using the given dimensions and solve for x.
The proportion will look like this:
12/10 = 18/15 = 24/x
Cross-multiplying and simplifying, we get:
12x = 240
x = 20
Therefore, the length of the missing side in the second triangle is 20.
Note: The question is incomplete. The complete question probably is: Solve for length of the missing side in the pair of similar triangles. The dimensions of one triangle are 12, 18, and 24, and the dimensions of the second triangle is 10, 15, and x. (These are corresponding measurements).
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