22 gallons of the first brand (35% pure antifreeze) and 88 gallons of the second brand (60% pure antifreeze) to make 110 gallons of a mixture that contains 55% pure antifreeze.
Let x be the number of gallons of the first brand (35% pure antifreeze) needed, and y be the number of gallons of the second brand (60% pure antifreeze) needed to make the desired mixture.
We know that the total volume of the mixture is 110 gallons and the desired concentration of antifreeze is 55%.
We can set up two equations based on the amount of antifreeze and the total volume of the mixture:
0.35x + 0.6y = 0.55(110) (amount of antifreeze)
x + y = 110 (total volume)
Simplifying the first equation, we get:
0.35x + 0.6y = 60.5
Now we can use substitution or elimination to solve for x and y. Here's one way to use substitution method
x + y = 110 (equation 1)
x = 110 - y (solve for x)
0.35x + 0.6y = 60.5 (equation 2, substitute x)
0.35(110 - y) + 0.6y = 60.5 (substitute x into equation 2)
38.5 - 0.35y + 0.6y = 60.5 (distribute 0.35)
0.25y = 22 (combine like terms)
y = 88 (divide both sides by 0.25)
So we need 88 gallons of the second brand (60% pure antifreeze). To find the amount of the first brand (35% pure antifreeze), we can substitute y back into equation 1:
x + y = 110
x + 88 = 110
x = 22 gallons
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if the shaded cross sections of the solids have the same area, which of the following corresponds to the value of a: the side length of the base of the square prism?
Therefore, the value of 'a' when the shaded cross-sections of the solids have the same area is
:a = √(4A/π).
To find out the value of a (side length of the base of the square prism) when the shaded cross-sections of the solids have the same area, we need to use the formula for the area of a square.
The area of a square is given by the formula: A = a², where 'a' is the side length of the square.
Now, let's look at the two solids given in the question.
The first solid is a square prism with base 'a' and height 'a'.The second solid is a right circular cylinder with radius 'a' and height '2a'.The cross-section of the square prism is a square with side length 'a'.The cross-section of the right circular cylinder is a circle with radius 'a'.
Given that the shaded cross-sections of the solids have the same area, we can equate the area of the square with the area of the circle.
A = πr², where 'r' is the radius of the circle Substituting the values of 'r' and 'a', we get:A = πa²/4 = a²/4Multiplying both sides by 4, we get:4A = πa²
Now we can solve for 'a' by taking the square root of both sides a = √(4A/π).
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if a data set is symmetrical, which statistical measure best represents the entire spread of the data set?
The best statistical measure to represent the entire spread of the data set when a data set is symmetrical is the standard deviation.
The standard deviation is a measure of how much the individual data points vary from the mean of the data set.
It is calculated by taking the square root of the variance.
It is the average of the squared differences of each data point from the mean.
In a symmetrical data set, the mean, median, and mode are all equal and located at the center of the data set.
This represents that the data points are evenly distributed around the center.
The standard deviation can provide a good measure of the spread of the data points from this center.
Other measures of spread representing the range or interquartile range, may not be as useful in a symmetrical data set .
As they are more affected by outliers and skewness in the data.
Therefore, the symmetrical data set in best way represented by statistical measure known as standard deviation.
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To refresh your memory of 9th grade math read Chapter 12. Complete the following table of angle and side measurements. Right Angles Angle A B C a b c
1 40 __ 90 __ __ 55 2 __ 55 __ __ 77 __
3 35 __ __ __ 68 83
4 __ __ __ 50 70 __
To refresh your memory of 9th-grade math, read Chapter 12. Complete the following table of angle and side measurements.
Right AnglesAngleA B C a b c
1 40 50 90 50 40 552 35 55 90 55 35 77
3 35 55 90 55 35 684 30 60 90 60 30 855 60 30 90 60 30 906 45 45 90 45 45 63
The above given table represents the values of angles and sides of the right-angled triangles. In the right-angled triangle, one angle measures 90°, and this angle is known as the right angle.
Further, the sum of other two angles measures 90°.In the above table, a, b and c are sides, and angles A, B, and C are opposite angles of a, b, and c, respectively.
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Can you guys please help me with this question I think it’s A. but I’m not sure if it’s correct?!PLEASEEE
Answer:
A is correct
Step-by-step explanation:
Whatever value you put in for "y" will keep both of the equations equal
Write a function y=ab^x that passes through (2,45) and (5,3072)
Therefore, the exponential function that passes through the points (2,45) and (5,3072) is: y = (45/16) ([tex]4^{x}[/tex]).
What is function?In mathematics, a function is a rule that assigns to each element in a set called the domain, a unique element in another set called the range. In other words, a function is a mathematical object that takes an input and produces a specific output, according to a specific set of rules or operations.
by the question.
The general form of the exponential function is y = [tex]ab^{x}[/tex] where a and b are constants. To find the values of a and b that satisfy the given conditions, we can use the two points (2,45) and (5,3072) and solve for a and b.
First, we can write two equations based on the two points:
45 = a[tex]b^{2}[/tex] (1)
3072 = ab^5 (2)
We can then divide (2) by (1) to eliminate a:
3072/45 = (a[tex]b^{5}[/tex])/ (a[tex]b^{2}[/tex])
68 = [tex]b^{3}[/tex]
Solving for b, we get:
b = 4
Substituting this value of b into either (1) or (2) to solve for a, we get:
45 = a ([tex]4^{2}[/tex])
a = 45/16
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Enter the correct answer in the box.
Write this expression in simplest form.
Don’t include any spaces or multiplication symbols between coefficients or variables in your answer.
16h^(10/2) *remove the root sign
16h^5 *simplify the exponent
Answer: 16h^5
Step-by-step explanation: im correct
g a random sample of 100 automobile owners in the state of alabama shows that an automobile is driven on average 23,500 miles per year with a standard deviation of 3900 miles. assume the distribution of measurements to be approximately normal. a) construct a 99% confidence interval for the average number of miles an automobile is driven annually in alabama.
We can be 99% confident that the average number of miles an automobile is driven annually in Alabama is between 21,342.6 and 24,637.4 miles
To answer this question, we need to use the following formula for a confidence interval for the mean: CI = (μ - z*(σ/√n), μ + z*(σ/√n)), Where μ is the population mean, z is the z-score for the given confidence level, σ is the population standard deviation, and n is the sample size. Using the given information, we can calculate the confidence interval for the mean:CI = (23500 - 2.575*(3900/√100), 23500 + 2.575*(3900/√100)), CI = (21342.6, 24637.4)
To summarize, we used the formula for a confidence interval for the mean and the given information to calculate the confidence interval for the average number of miles an automobile is driven annually in Alabama. This confidence interval is (21342.6, 24637.4), which means we can be 99% confident that the average number of miles an automobile is driven annually in Alabama is between 21,342.6 and 24,637.4 miles.
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A city's population was 84,000 at the beginning of 2020. If the city's population increases by 4% per year, how many years will it take for city's population to reach 132,000 people? a. The answer to this question is the solution to what equation? [Let a represent the number of years since the beginning of 2020.] Preview b. Solve the equation in part (a)
a. The answer to this question is the solution to the equation:
84000(1 + 0.04)^a = 132000
Where "a" represents the number of years since the beginning of 2020, and 0.04 is the decimal equivalent of 4%.
We use the formula for compound interest, which is A = P(1 + r/n)^(nt), where A is the final amount, P is the principal, r is the interest rate, n is the number of times interest is compounded per year, and t is the time in years. In this case, we assume that the population growth rate is compounded annually, so n = 1.
b. Solving the equation in part (a), we get:
(1 + 0.04)^a = 132000/84000
1.04^a = 1.5714
a = log(1.5714)/log(1.04)
a ≈ 9.9 years
Therefore, it will take approximately 9.9 years for the city's population to reach 132,000 people, assuming a 4% annual growth rate.
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Can someone please help me with this?
Answer:
Yes they are congruent
Option B is correct
Step-by-step explanation:
Opisite sides of parallelogram are congurent so,
BA is congruent to CD (side)
And
BE I congruent to ED (Side)
AE is congruent to EC (Side)
So according to side-side-side congurence theorem triangle ABE is congruent to triangle CDE
Hope you understand :)
Can someone help me find the elevation of the sun I need the answers that are highlighted in yellow please help image below
By using Pythagοrean theοrem, the angle οf elevatiοn tο the sun, vertical height, hοrizοntal distance, slant height, tangent and angle οf elevatiοn is 51°
What is Pythagοrean theοrem ?The Pythagοrean theοrem is a fundamental result in Euclidean geοmetry that describes the relatiοnship between the three sides οf a right-angled triangle.
In equatiοn fοrm, this can be written as:
[tex]c^2 = a^2 + b^2[/tex]
Where c is the length οf the hypοtenuse, and a and b are the lengths οf the οther twο sides (alsο knοwn as the legs) οf the right-angled triangle.
a) The Name οf the angle οf elevatiοn is: angle οf elevatiοn tο the sun
b) The Name οf the Hypοtenuse side is: vertical height (bοdy height)
c) The Name οf the Oppοsite side is: hοrizοntal distance (shadοw length)
d) The Name οf the Adjacent side is: slant height (hypοtenuse οf the triangle fοrmed by the bοdy, the tip οf the shadοw, and the sun)
e) The Trig Ratiο I will be using is: tangent (οppοsite/hypοtenuse) because we are given the οppοsite side and the hypοtenuse.
f) Shοw the wοrk tο find the angle οf elevatiοn. Rοund tο the nearest degree:
tan(angle οf elevatiοn) = οppοsite/hypοtenuse
tan(angle οf elevatiοn) = 45/34
angle οf elevatiοn [tex]= tan^{-1(45/34)[/tex]
angle οf elevatiοn ≈ 51°
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using quicksort, if the pivot is [ 28 ], which values are found to be in the wrong partition after the first pass across the array? 28 17 45 51 35 14 88 24
There are no values in the wrong partition after the first pass across the array using quicksort when the pivot is [28].
The given problem states that using quicksort, if the pivot is [28], which values are found to be in the wrong partition after the first pass across the array? {28, 17, 45, 51, 35, 14, 88, 24}.Quicksort is a sorting algorithm that uses the divide and conquer approach. Here’s how to find out which values are found to be in the wrong partition after the first pass across the array .Step-by-step The first thing to do is to pick the pivot value. It can be any element in the array. The pivot value is 28.Then, the partition function is performed to place the pivot element in its final position in the sorted array.
All the values smaller than the pivot will be on the left side, and all the values greater than the pivot will be on the right side of the pivot. Here’s the array after the partition: 17 24 14 [28] 35 45 51 88Now, the elements to the left of the pivot are 17 24 14, and the elements to the right of the pivot are 35 45 51 88. Since the pivot is placed in its final position, there are no values in the wrong partition after the first pass across the array. Therefore, there are no values in the wrong partition after the first pass across the array using quicksort when the pivot is [28].
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19. Assertion(A): The graph of the linear equation 7x - 2y = 6 cuts the Y-axis at the point (0, -3). Reason(R): The coordinates of any point on the Y-axis is (a, 0), where a is any real number. pls help
get the answer
Answer:
Pretty sure its C
Step-by-step explanation:
To cut through y axis, x axis is always 0, So it would be (0, a) where a is any real number, not (a,0) as is given in reason.
How many pounds of eroded material does the verde riveer carry past given point in 1/4 of a day
The Verde River's discharge and sediment load determine how much eroded material it can move beyond a given site in 6 hours, or 1/4 of a day. We cannot accurately determine the amount of eroded material carried by the river without knowing these numbers.
The amount of water that flows past a specific place in a river per unit of time is known as its discharge. The amount of sediment (including eroded material) that a river carries is referred to as its sediment load.
Both of these numbers can fluctuate considerably based on a number of variables, including the time of year, regional geology, and weather patterns.
In order to precisely determine the amount of eroded debris carried by the Verde River past a specific point in 1/4, thus we need further information.
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if other factors are held constant, which of the following sets of data would produce the largest t-statistic for an independent-samples t-test?
The set of data that would produce the largest t-statistic for an independent-samples t-test is the one with the largest difference between the sample means and the smallest variability within each sample.When other factors are held constant, the t-statistic for an independent-samples t-test is given by the following formula:
t=(x1 − x2)/ SEwhere x1 and x2 are the means of the two samples, and SE is the standard error of the difference between the means. The standard error of the difference between the means is given by:SE = sqrt [s1^2/n1 + s2^2/n2]where s1 and s2 are the standard deviations of the two samples, and n1 and n2 are the sample sizes. Therefore, the t-statistic can be maximized by maximizing the difference between the sample means and minimizing the variability within each sample.Therefore, the set of data that would produce the largest t-statistic for an independent-samples t-test is the one with the largest difference between the sample means and the smallest variability within each sample.
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Who ever helps me, Get 100 points
Step-by-step explanation:
a) Area=144m²
side²= 144
side=12m
b) perimeter=32m
4×side=32
side=32/4
side=8m
the centroid of a triangle is located 12 units from one of the vertices of a triangle. find the length of the median of the triangle drawn from that same vertex
a. 16
b. 18
c. 24
d. 36
e. 48
Length of the median of the triangle is b. 18
How to find the length of the median of a triangle?
Given that the centroid of a triangle is located 12 units from one of the vertices of a triangle. We need to find the length of the median of the triangle drawn from that same vertex.
Let ABC be a triangle.
Let AD be median of the triangle.
Let E be centroid of ΔABC
Length of the median of triangle = AD
AD = Length of AE + Length of ED
But,
AE = 12
ED = x
So,
AD = 12 + x
Since, centroid divides median in 2:1 ratio.
Then,
[tex]12 : x = 2 : 1\\12/x = 2/1\\\\12= 2x\\[/tex]
Divide by 2 each side
[tex]x = 6[/tex]
So, AD = 12 + x = 12 + 6 = 18
Thus, Length of the median of triangle is 18.
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Please help me on this!
Answer:
One solution
Step-by-step explanation:
I added a photo of my solution
Answer:
The system has one solution: (0, 4).
FOR BRAINLIEST!!
Directions: Solve for x. The figure is a parallelogram
Answer:
Answer is in the picture
Step-by-step explanation:
Hope you understand :)
Answer:
x = 10-----------------------------
According to one of the properties of a parallelogram, any two consecutive interior angles are supplementary.
We know supplementary angles add up to 180°.
Apply this property to the given parallelogram and set up the following equation:
35 + 14x + 5 = 18014x + 40 = 18014x = 140x = 10Rewrite the equation to substitute for the variable
(x):
[Do not find a solution for x]
x + y = 15
The system of equations x + y = 15 and 2x + 3y = 24
What is an equation?
The definition of an equation in algebra is a mathematical statement that demonstrates the equality of two mathematical expressions.
To substitute for the variable x in the equation x + y = 15, we can rearrange the equation to solve for x in terms of y:
x = 15 - y
Then we can substitute this expression for x in any other equation that involves x.
2(15 - y) + 3y = 24
Simplifying this equation gives:
30 - 2y + 3y = 24
y = -6
Then we can substitute this value back into our expression for x to get:
x = 15 - (-6) = 21
So the solution to the system of equations x + y = 15 and 2x + 3y = 24 is (x, y) = (21, -6), but the question only asked us to rewrite the equation to substitute for x.
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Solve the following simultaneous equations algebraically
xy = 6
y-x=1
Step-by-step explanation:
xy=6
x=6/y (1)
now,
XY=6
6/y-y=6
A triangle is shown on the coordinate plane below.
1 unit
H
y
(-1,9) of
-(-1, 2)
7
6
5
-3
3 d
(7,2)
-7-6-5-4-3-2-1 0 1 2 3 4 5 6 7
-11
-2
What is the area of the triangle?
Il unit
X
You answer would be mate it would be x=66
5 A bathtub contains 35.5 liters of water.
When the plug is removed, 5 liters of wate
drain from the bathtub each minute. How
many minutes will it take all of the water to
drain from the bathtub?
A 177.5
B 7.1
C 17.75
D 6.95. i cant find my answer
Answer:
Option B
Step-by-step explanation:
Using Proportionality, we get
Let x be the quantity of water in bathtub. Y be time it be removed.
By formula, x2/y2= k = x1/y1
x/y = 5/1(x1=5, y1= 1)[Given]
5x2= 35.5
35.5 = 5y2
=> y = 35.5/5 = 7.1 minutes
make multiplying and dividing rational numbers worksheet?
Multiplication and division of regular numbers are the same as fractions and we will learn them with the multiplication and division of rational numbers worksheet.
To do the multiplication, first find the greatest common divisor of the numerator and the denominator. The factors are then grouped together so that the score equals one. Then multiply by the remaining factors. To divide, first rewrite the division as multiplication by the inverse of the denominator.
Cuemath's interactive math worksheets contain visual simulations to help your child visualize the concepts being taught, "see things as they really are, and reinforce learning from them". The Rational Numbers Multiplication and Division Worksheet follows a step-by-step learning process that helps students better understand concepts, identify errors, and eventually develop strategies for solving future problems.
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In a study of the effects of marijuana during pregnancy, measurements on babies of mother who used marijuana during pregnany were compared to measurements on babies of mothers who did not. A 95% confidence interval for the difference in mean head circumference (nonuse minus use) was .61 to 1.19 cm. What can be said from this statement about a p-value for the hypothesis that the mean difference is zero?
The 95% confidence interval of .61 to 1.19 cm provides strong evidence that there is a difference in mean head circumference between babies of mothers who used marijuana during pregnancy and those who did not. Furthermore, the small p-value suggests that the mean difference is statistically significant, and is not likely to be zero.
The 95% confidence interval for the difference in mean head circumference between babies of mothers who used marijuana during pregnancy and those who did not is .61 to 1.19 cm. This implies that the true mean difference is likely to be between .61 and 1.19 cm. The p-value is a measure of how likely it is that the difference in means is zero, and can be used to assess the statistical significance of the difference in means.
Therefore, the p-value for the hypothesis that the mean difference is zero is very small and can be considered statistically significant.
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The small p-value suggests that the mean difference is statistically significant, and is not likely to be zero.
A 95% confidence interval (CI) is a range of values that is expected to include the true population mean with a probability of 0.95. The CI for the difference in mean head circumference between non-users and users of marijuana during pregnancy is 0.61 to 1.19 cm.
This means that the sample mean difference (nonuse minus use) falls within this interval.
If the true population mean difference were zero, the sample mean difference would fall within the range of random sampling error, and the null hypothesis that there is no difference between the groups would be supported.
However, since the 95% CI does not include zero, we can conclude that the difference is statistically significant at the 0.05 level.
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ABCD is a quadrilateral in which BD = 15 cm., perpendiculars from A and Con BD are 6 cm and 8 cm respectively. Calculate the area of the quadrilaterals
The area of the quadrilateral is 161.24 cm².
How to deal with quadrilateral?We can see that we can divide the quadrilateral into two triangles: ABD and CBD. We know that the height of ABD is 6 cm and the height of CBD is 8 cm. We also know that BD is 15 cm. To find the area of each triangle, we need to find the base of each triangle. We can do this using the Pythagorean theorem.
For triangle ABD:
AB² = AD² + BD²
AB² = (6 cm)² + (15 cm)²
AB² = 261 cm²
AB = [tex]\sqrt(261) cm[/tex]
For triangle CBD:
BC² = CD² + BD²
BC² = (8 cm)² + (15 cm)²
BC² = 289 cm²
BC = 17 cm
Now we can find the areas of the triangles:
Area of ABD =[tex]\frac{1}{2}[/tex] * AB * 6 cm
Area of ABD = [tex]\frac{1}{2}[/tex] * [tex]\sqrt(261) cm[/tex] * 6 cm
Area of ABD = 93.24 cm^2
Area of CBD = [tex]\frac{1}{2}[/tex] * BC * 8 cm
Area of CBD = [tex]\frac{1}{2}[/tex] * 17 cm * 8 cm
Area of CBD = 68 cm²
Finally, we can find the area of the quadrilateral by adding the areas of the triangles:
Area of ABCD = Area of ABD + Area of CBD
Area of ABCD = 93.24 cm² + 68 cm²
Area of ABCD = 161.24 cm²
Therefore, the area of the quadrilateral is 161.24 cm².
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Will give brainlest to first correct answer!!!
Evelyn has a bag that contains 3 red marbles and 2 blue marbles.
Evelyn randomly pulls a marble from the bag and then puts it back in the bag. She repeats this 20 times. How many times should she expect to draw a red marble from the bag?
Answer:
She will draw 120 times for a red marble
Step-by-step explanation:
Assume that women have heights that are normally distributed with mean of 63.6 inches and a standard deviation of 2.5 inches. Find the value of the quartile Q3. A) 66 inches B) 65.3 inches C) 67.8 inches D) 64.3 inches 3
The correct option is B. The value of the quartile Q3 is 65.3 inches
Quartile is a type of statistical value that represents one-fourth of a dataset. It divides a dataset into four equal parts. Q1, Q2, and Q3 are the first, second, and third quartiles, respectively.
The formula for the third quartile is as follows:
Q3 = μ + (0.67 × σ), where μ is the mean and σ is the standard deviation.
Given:
Mean = μ = 63.6 inches
Standard deviation = σ = 2.5 inches
The value of the quartile Q3 can be found by substituting the given values in the formula.
Q3 = μ + (0.67 × σ)
Q3 = 63.6 + (0.67 × 2.5)
Q3 = 63.6 + 1.675
Q3 = 65.275 ≈ 65.3
Therefore, the value of the quartile Q3 is 65.3 inches. Therefore, option B is the correct answer.
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Classify the polynomial
X+2
Urgent !!!
Answer: Quadratic polynomial.
Step-by-step explanation: Polynomials with 2 as the degree.
Idil drove 12 miles in 1/5 of an hour. On average how fast did she drive in miles per hour
If Idil drove 12 miles in 1/5an hour on average, then she drove at an average speed of 60 miles per hour.
To calculate the average speed of Idil's car in miles per hour, we need to divide the distance she drove (12 miles) by the time it took her to drive that distance (1/5 hour):
Average speed = distance ÷ time
Average speed = 12 miles ÷ (1/5) hour
To divide by a fraction, we can multiply by its reciprocal, so:
Average speed = 12 miles × 5/1 hour
Average speed = 60 miles per hour
Therefore, Idil drove at an average speed of 60 miles per hour.
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Solve the following equation using the graphing method. Write answers in set notation. Round irrational solutions to the nearest tenths place (1 decimal).
Equation: 5x^2+2x-6=0
Thus, from the attached graph the, solution of the equation in set notation is found as: Domain = (-∞, +∞) and Range: [6, ∞).
Explain about the graphing method?The visual method actually only requires three easy actions to complete:
Slope-Intercept Form should be applied to both equations.Each linear equation's graph should appear within the similar coordinate plane.Identify the system's solution.
If the lines cross, the system's solution can be found by using the coordinates of such intersection point.The problem cannot be solved if the lines are parallel.There are an endless number of solutions if the lines meet, which means they form a single line.The given equation is-
5x^2+2x-6=0
Since it is a quadratic equation it will have 1 value on y axis for every two values for x.
The graph will be quadratic with 2 degree.
Using the graphing tool, draw the graph.
Thus, from the attached graph the, solution of the equation in set notation is found as:
Domain = (-∞, +∞)
Range: [6, ∞)
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