Answer:
8.15
Step-by-step explanation:
halfway means the middle value. Therefore the mean.
(8 + 8.3)/2
= 8.15
449 students were surveyed about their preferences of sports. 146 students like football, 107 students like baseball, and 49 students like both sports. how many students like exactly one of the two sports?
449 students were surveyed about their preferences for sports. 146 students like football, 107 students like baseball, and 49 students like both sports. there are 293 students like exactly one of the two sports.
This can be determined by subtracting the number of students who like both sports (49) from the total number of students surveyed (439). This leaves us with 390 students who like either football, baseball, or both. To find the number of students who like exactly one of the two sports, we will need to subtract the number of students who like both sports from the number of students who like either football or baseball.
To do this, we add together the number of students who like football (146) and the number of students who like baseball (107). This gives us 253 students who like either football or baseball. Subtracting this number (253) from the number of students who like either sport (390) gives us the number of students who like exactly one of the two sports (293).
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If $m$ is a real number and $2x^2 mx 8$ has two distinct real roots, then what are the possible values of $m$
The possible values of [tex]$m$[/tex] are all real numbers greater than [tex]$\frac{2}{x^2}$[/tex]
A quadratic equation is an equation of the form ax² + bx + c = 0, where a, b, and c are real numbers and a ≠ 0. It is called a quadratic equation because the highest degree of its unknown variable (x) is two. The solutions of a quadratic equation can be found by solving the equation using the quadratic formula, factoring, or graphing. Quadratic equations are used in many areas of mathematics, from basic algebra to differential equations.
Let [tex]$y = 2x^2mx8$[/tex]
The two distinct real roots of the equation imply that y is a quadratic equation with two distinct real roots.
So,[tex]$y = 0 = 2x^2mx8 \implies 2x^2mx - 8 = 0$[/tex]
Using the quadratic formula , [tex]$m = \frac{8}{2x^2x}$[/tex]
The two distinct real roots of the equation imply that the discriminant of the quadratic equation, [tex]$\Delta = b^2-4ac$[/tex] is greater than 0.
So, [tex]$\Delta = (2x^2)^2-4(2)(-8) > 0 \implies 4x^4 + 64 > 0$[/tex]
[tex]$4x^4 > -64 \implies x^4 > -16$[/tex]
So, [tex]$m > \frac{8}{2x^2x} \implies m > \frac{8}{2x^2(-4)} = \frac{2}{x^2}$[/tex]
Hence, the possible values of m are all real numbers greater than [tex]$\frac{2}{x^2}$[/tex]
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how many ways can 3 club members be chosen as president, vice president, and treasurer if there are 8 eligible members for these positions? describe this problem in terms of strings, a combinations, or permutations as you see appropriate (more than one correct description is possible).
The required ways can 3 club members be chosen as president, vice president, and treasurer are 56.
What is Combination?When the order doesn't matter, the combination is a choice between all of the objects in the set or just a portion of them. As a result, the combination formula is provided by; n, and the number of combinations of n objects taken r at a time.
According to question:Total number of eligible members for these positions = 8
To choose three members,
C(8, 3)
(8×7×6)/(3×2)
336/6
= 56 ways.
Thus,the required number of ways are 56.
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Can anyone help me please
Answer:
2
Step-by-step explanation:
-4+6=2
does part 95.987 mean i can use my 10 meter radio on cb, so long as i follow the rules on frequency, and power?
No, You cannot use your 10 meter radio on CB (citizen’s band), so long as you follow the rules on frequency, and power.
What is Citizen's Band?A public, two-way personal radio service is the Citizen's Band (CB) Radio Service, usually abbreviated as CB. There are various categories for CB operating. The most popular CB method is voice communication, which rose to popularity in the 1970s. Mobile CB operating is still common, particularly in automobiles and trucks. The majority of CB operating occurs in a constrained range of frequencies around 27 MHz. This band contains 40 channels. There is excessive channel saturation.
A CB (citizen’s band) radio must be FCC type approved. Of course, I have no idea where you are, so maybe, where you are, it is ok. In the US however, CB radios are not to be “easily modified” neither to increase power out nor to allow operation outside the citizen’s band frequencies. Even as an extra class amateur radio licensee, I may not use a modified radio on the CB band. I am allowed, however to modify a CB radio to operate on amateur radio bands.
You cannot use your 10 meter radio on CB (citizen’s band), so long as you follow the rules on frequency, and power.
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Which scenario does NOT represent an additive relationship? A) Mason is five years older than Greg. B) Apples cost $2.50 per pound. C) Bernie's Burgers charges a $3.00 delivery fee for all orders. D) Perla's Pet Shop is offering a $5.00 coupon off any order.
Answer:
B. Apples cost $2.50/pound
Step-by-step explanation:
B would be a multiplicative relationship because you would multiply the number of pounds by 2.50
There are two pairs $(x,y)$ of real numbers that satisfy the equation $x+y = 3xy = 4$. Given that the solutions $x$ are in the form $x = \frac{a \pm b\sqrt{c}}{d}$ where $a$, $b$, $c$, and $d$ are positive integers and the expression is completely simplified, what is the value of $a + b + c + d$?
The value of expression (a + b + c + d) is 20
Consider given equations x + y = 4 ........(1)
and 3xy = 4 .........(2)
The solutions of given equations are of the form [tex]$x = \frac{a \pm b\sqrt{c}}{d}$[/tex]
where a, b, c, and d are positive integers and the expression is completely simplified.
From equation (2),
y = 4/3x
Substitute above value of y in equation (1),
x + y = 4
x + (4/3x) = 4
3x² + 4 = 12x
3x² - 12x + 4 = 0
After solving above quadratic equation we get,
[tex]x=\frac{6\pm 2\sqrt{6} }{6}[/tex]
Comapring this solution with [tex]$x = \frac{a \pm b\sqrt{c}}{d}$[/tex] we get,
a = 6, b = 2, c = 6 and d = 6
Now we find the value of expression (a + b + c + d)
a + b + c + d
= 6 + 2 + 6 + 6
= 20
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PLEASE HELP ASAPMATH SUBJECT
Answer:
first three are correct answers last two are not
Step-by-step explanation:
quadratic equations are in the for y=ax²+bx+c
y= f(X)
for the line segment below, the ratio of the length of mn to the length of no is 3:7. if it can be determined, what is the ratio of the length of mn to the length of mo ?
For the line segment MO, the ratio of the length of MN to length of NO is 3 : 7. The ratio of the length of MN to length of MO is 3 : 10.
Ratio or proportion is the relation describing the size, quantity, or the amount of two or more variables.
For example, the ratio of sugar and flour in a cake dough is 1 : 2. It means, if there is 200 grams of sugar in the dough, the amount of flour is 2 x 200 = 400 grams.
In the given problem, the ratio of length MN to the length NO is 3 : 7.
Notice that:
MO = MN + NO
Hence, the ratio of the length of MN to the length of MO is:
MN : MO = MN : (MN + NO)
MN : MO = 3 : (3 + 7)
MN : MO = 3 : 10
The picture in your question is missing. Most likely it was like the one in the attached picture.
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you have a fair coin and want to calculate the probability that if you flip the coin 20 times, you will get exactly 14 heads. what is the probability for this event?
The probability of getting exactly 14 heads by flipping a fair coin 20 times is 0.03696.
The number of times a fair coin is flipped = 20
The outcomes for flipping the coin once = 2
Therefore, the outcomes for flipping the coin 20 times = (2) ^ 20
Number of heads needed = 14
The number of ways of getting exactly 14 heads = 20C14
20C14 is the 20! / (14! (20-14)! = 38760
Probability of getting an event = possible outcome / total outcomes
Thus, the probability of getting exactly 14 heads by flipping a fair coin 20 times = (20C14) / (2 ^ 20) ≈ 0.03696
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a bag contains ten balls, some of which are red and the rest of which are yellow. when two balls are drawn at random at the same time, the probability that both balls are red is $\frac{1}{15}$. how many balls in the bag are red?
On solving the provided question we can say that Probability of Red * Second Draw Probability of Red = [tex]3 / 10 * 2 / 9 = 6 / 90 = 1 / 15[/tex]
What is probability?Probability theory, a subfield of mathematics, gauges the likelihood of an occurrence or a claim being true. An event's probability is a number between 0 and 1, where approximately 0 indicates how unlikely the event is to occur and 1 indicates certainty. A probability is a numerical representation of the likelihood or likelihood that a particular event will occur. Alternative ways to express probabilities are as percentages from 0% to 100% or from 0 to 1. the percentage of occurrences in a complete set of equally likely possibilities that result in a certain occurrence compared to the total number of outcomes.
Let the number of red balls = x
[tex][x / 10] * [ (x - 1) / 9 ] = 1/15 \\x(x - 1) / 90 = 1/15 \\x ( x - 1) = 6 \\x^2 - x - 6 = 0 \\(x -3) ( x + 2) = 0 \\x = 3 or x = -2[/tex]
here are 3 red balls
Probability of Red * Second Draw Probability of Red
[tex]3 / 10 * 2 / 9 = 6 / 90 = 1 / 15[/tex]
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At what points do the graphs of y=2x+1 and y=-(x-1)^2+3 intersect?
A. (-3,5) and (1,3)
B. (-2,-6) and (2,2)
C. (-1,-1) and (1,3)
D. (1,3) and (3,7)
Answer:
D. (1,3) and (3,7)
Step-by-step explanation:
The graphs of y = 2x + 1 and y = -(x-1)^2 + 3 intersect at the points where they have the same y-coordinate. To find these points, we can set the two equations equal to each other and solve for x.
y = 2x + 1 = -(x-1)^2 + 3
2x + 1 = -x^2 + 2x + 2
x^2 - 4x + 1 = 0
(x-1)^2 = 0
x = 1
Now we can substitute this value of x into either of the given equations to find the corresponding y-coordinate.
y = 2x + 1 = 2(1) + 1 = 3
so the point of intersection is (1,3)
So the answer is D. (1,3) and (3,7)
Please note that the solution is valid only if the two equations y=2x+1 and y=-(x-1)^2+3 are defined for the same domain.
A sports marketing company is interested in how many hours teenagers in a town spend watching sports. They randomly select 40 teenagers in this town and ask how many hours per week they spend watching sports. The mean amount is 6.25 hours with a standard deviation of 4.33 hours. Which of the following is the 90% confidence interval for the true mean amount of time teenagers from this town watch sports
(5.097, 7.404) is the 90% confidence interval for the true mean amount of time teenagers from this town watch sports. This can be solved using the concept of standard deviation.
What is standard deviation?Data dispersion in regard to the mean is quantified by a standard deviation, or "σ". Data are said to be more closely grouped around the mean when the standard deviation is low and more dispersed when the standard deviation is high.
Because it makes measures easier to comprehend when the data is spread, standard deviation is significant. The data's standard deviation will increase as the data's distribution becomes more widely scattered. The deviation of each observed value from the mean is measured using this metric. The majority of data in any distribution will fall within a 2 standard deviation range of the mean.
Thus, (5.097, 7.404) is the 90% confidence interval for the true mean amount of time teenagers from this town watch sports.
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The complete question is as follows:
A sports marketing company is interested in how many hours teenagers in a town spend watching sports. They randomly select 40 teenagers in this town and ask how many hours per week they spend watching sports. The mean amount is 6.25 hours with a standard deviation of 4.33 hours. Which of the following is the 90% confidence interval for the true mean amount of time teenagers from this town watch sports?
Find the t-table here.
(4.396, 8.104)
(4.865, 7.635)
(5.097, 7.404)
(5.245, 7.256)
The graph shows the population y of a certain city over the course of 10 years x. The equation of the trend line shown is y=1.9x+21. Answer parts a and b. Click the icon to view the scatter plot. Question content area bottom. The population will reach 52,900 during year 16. Part 2 b. In the tenth year, the population was actually 2,000 people from what the trend line shows. What could the actual number of people be in 10 years?
The actual number of people could be _ or _
(Use ascending order. Round to the nearest thousand as needed.)
The actual number of people in 10 years could be 57,000 or 56,000. The equation of the trend line is y=1.9x+21, so for any year x, the population y can be found using this equation. To find the population in 16 years, when the population is 52,900, we can plug in x=16 and solve for y to find y=52,900. To find the population in 10 years, when the population is 2,000 people from what the trend line shows, we can plug in x=10 and solve for y to find y=50,900. Since the population should be 2,000 more, the actual population in 10 years is either 57,000 (50,900 + 2,000) or 56,000 (50,900 + 1,000).
Answer:
Part A is 16
Step-by-step explanation:
PLEASE HELP MEEE!!! WILL GIVE BRAINLIEST!!
A figure is transformed according to the rule (x,y)= (x-1,y+4). Describe exactly what type of transformation has taken place.
Answer:
The transformation described is a horizontal translation of 1 unit to the left and a vertical translation of 4 units up. The transformation moves every point on the x-axis one unit to the left and every point on the y-axis four units up.
Step-by-step explanation:
It can also be thought of as a transformation that shifts the entire figure one unit to the left and four units up.
Write the word sentence as an equation. Then solve the equation.
9 is the difference of a number n and 7.
An equation that represents this word sentence is
The solution is n=
The equation that represents this word sentence is n-7 = 9
The value of n = 16
What is an algebraic expression?An algebraic expression can be defined as an expression that is composed of variables, terms, coefficients, constants and factors.
They are also made up of mathematical or sometimes called arithmetic operations, such as;
SubtractionAdditionMultiplicationDivisionBracketParenthesesFloor divisionFrom the information given, we have that;
9 is the difference of a number n and 7.
This is represented as;
n - 7 = 9
Now, collect like terms
n = 9 + 7
Add the values
n = 16
Thus, the value is 16
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19>15+x I am so confused and need help for homework.
Answer: x<4
Step-by-step explanation:
19>15+x
4>x
x<4 is the answer
Answer:
Since 15+x is less than 19. 15+x cannot equal to or greater than 19. If x is greater or equal to 4, the answer will be equal to or greater than 19 which is not true for the equation shown above.
So x is less than 4.
3/5 + 5/7 = ____
6/12 + 9/12 ____
1/4 + 4/4 = ____
2/3 + 5/3 = ____
(fractions)
Answer:
1. 46/35 or 1 11/35
2. 5/4 or 1 1/4
3. 5/4 or 1 1/4
4. 7/3 or 2 1/3
Step-by-step explanation:
The following equation is being multiplied by the LCD. Complete the multiplication to eliminate the denominators
x+2/3x - 1/x-2 = x-3/3x
(3x)(x-2) [x+2/3x - 1/x-2] = (3x)(x-2) [x-3/3x]
The resulting equation is ___
The resulting equation is (x-2) (x+2)-1(3x) = (x-3) (x-2).
The lowest integer that unites all of the fractions in a given collection is known as the least common denominator (LCD).
Given that,
The equation x+2/3x - 1/x-2 = x-3/3x is being multiplied by the least common denominator (LCD)
So, further solving this equation,
x+2 / 3x - 1/x-2 = x-3/3x
Here, the least common denominator (LCD) is (3x)(x-2). so we multiply the whole equation by the least common denominator (LCD).
(3x)(x-2) (x+2/3x - 1/(x-2) = x-3 / 3x)
We multiply each term by the least common denominator (LCD).
(3x)(x-2) (x+2/3x) - (3x)(x-2)(1/(x-2)) = (3x)(x-2)(x-3 / 3x)
Thus, we get (x-2) (x+2)-1(3x) = (x-3) (x-2).
Therefore,The resulting equation is (x-2) (x+2)-1(3x) = (x-3) (x-2).
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Answer:
D
Step-by-step explanation: answer is d
1. a woodworker produces 2 chairs every day. the company that buys the chairs randomly selects the days on which to check the chairs made that day. does this result in a random sampling? yes, because each item has an equal chance of being selected. no, because each group of n items does not have an equal chance of being selected. yes, because each group of n items has an equal chance of being selected. no, because each item does not have an equal chance of being selected.
Yes, this results in a random sampling because every day the woodworker produces two chairs, and the company that buys the chairs randomly selects the days on which to check the chairs made that day.
This means that each item (each chair) has an equal chance of being selected, and each group of n items (in this case, two chairs) also has an equal chance of being selected. The probability of an item being selected can be calculated using the formula P(A) = n/N, where n is the number of items in the sample and N is the total number of items in the population. In this case, the probability of an item being selected is 2/2 = 1, and the probability of a group of two items being selected is 2/2 = 1. This shows that each item and each group of items has an equal chance of being selected, which means that this is a random sampling.
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The list shows numbers in order from least to greatest. -15, -3 4/5, -1.5, ____, 2.3, 5 2/3Which is an integer that can be inserted on the blank line in the list?a.-2 b. -1 1/3 c. 0 d. 1.2
An integer that can be inserted on the blank line in the list from the given options is 0.
Therefore the answer is c) 0.
The list shows numbers in order from least to greatest, that is ascending order -15, -3 4/5, -1.5, ____, 2.3, 5 2/3
The integer that can be inserted on the blank line in the list is c. 0, because it is greater than -1.5 and less than 2.3 and it is an integer.
-2 is less than -1.5. So they cannot be the answer. -1 1/3 is equal to -4/3 and 1.2 is greater than -1.5 and less than 2.3, but they are not integers.
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Please it’s a simple maths question :)
Answer:
1. To find the gradient of a line, we can use the slope-intercept form of the equation: y = mx + b, where m is the gradient and b is the y-intercept.
a) To find the gradient of (x+7)/(y-2) = 0, we can first rewrite the equation as y = (2x+14)/(x+7). To find the slope, we can take the derivative of y with respect to x. We get the slope or the gradient of the line as m = 2/(x+7).
b) To find the gradient of the line through (p,5) and (6,2p), we can use the point-slope form of the equation: y - y1 = m(x - x1). We can substitute the coordinates of the two points and solve for m.
y - 5 = m(x - p)
2p - 5 = m(6 - p)
2p - 5 = 6m - mp
mp + 6m = 2p + 5
m(p+6) = 2p + 5
m = (2p+5)/(p+6)
2. To find the equation of a line, we can use the slope-intercept form of the equation: y = mx + b, where m is the gradient and b is the y-intercept.
a) To find the equation of the line with a gradient of 3, passing through (0,5), we can substitute the values into the slope-intercept form.
y = 3x + b
5 = 3(0) + b
b = 5
The equation of the line is y = 3x + 5
3. To find the value of p, if the gradient of the line joining (-1,p) and (p, 4) is 2/3, we can use the point-slope form of the equation: y - y1 = m(x - x1). We can substitute the coordinates of the two points and the gradient, and solve for p.
y - p = (2/3)(x - (-1))
4 - p = (2/3)(p - (-1))
4 - p = (2/3)p + (2/3)
(2/3)p - 4 + p = (2/3)
p = 6
Final Answer: The value of p is 6.
Write an equation of the line passing through the point (8, 7) that is perpendicular to the line y 7
The equation of the line would be y = 17/7x + 1.
What is the equation of the line?
The equation of a line is a mathematical expression that describes the position of a line in a coordinate plane. It typically takes the form of "y = mx + b", where "m" is the slope of the line and "b" is the y-intercept, the point where the line crosses the y-axis.
The whole question is:
Write an equation of the line passing through the point (8,7) that is perpendicular to the line [tex]y + 7 = -\frac{7}{17}(x+8)[/tex]
To write the equation of a line that is perpendicular to a given line, we can use the slope of the given line and the point the new line passes through.
The slope of the line [tex]y + 7 = -\frac{7}{17}(x+8)[/tex] can be found by isolating y and then taking the derivative, which gives us: -7/17.
The slope of a line perpendicular to this line is the negative reciprocal of the given line's slope, which is 17/7.
We also know that the new line passes through the point (8,7). Using a point-slope form of a line which is (y-y1) = m(x-x1) where m is the slope, we can write the equation of the line as:
y - 7 = 17/7(x - 8)
So the equation of the line that passes through the point (8,7) and is perpendicular to the line [tex]y + 7 = -\frac{7}{17}(x+8)[/tex] is:
y = 17/7x + 1
Hence, the equation of the line would be y = 17/7x + 1.
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x² - 4x-20 = 0 pls help
Answer:
Step-by-step explanation:
x=2+2[tex]\sqrt{6}[/tex] or x=2-2[tex]\sqrt{6}[/tex]
Suzie has $9,126 in an account. The interest rate is 10% compounded annually.
To the nearest cent, how much will she have in 5 years?
Answer: $14697.51
Step-by-step explanation:
[tex]9126(1+0.10)^{5} \approx \$14697.51[/tex]
The mean of a set of data is 4.11 and its standard deviation is 3.03. Find the z score for a value of 10.86.
If the mean of a set of data is 4.11 and its standard deviation is 3.03. the z score for a value of 10.86 is: 2.23.
How to find the z-score?Using this formula to find the z-score
z-score = Value - Mean / Standard deviation
Where:
Value = 10.86
Mean = 4.11
Standard deviation = 3.03
Let plug in the formula
z-score = 10. 86 - 4.11 / 3.03
z-score = 6.75 /3.03
z-score = 2.227
z- score = 2.23
Therefore the z-score is 2.23.
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find the vectors t, n, and b at the given point. r(t) = (t^2, 2/3 t^3, t), (4, 16/3 , -2)
At the given point, (4, 16/3 , -2), the vectors t, n, and b are (2, 4, -1), (16, -8, 4), and (-32, 8, 8), respectively.
What is vector?Vector is a mathematical element that has both magnitude and direction. It is used to represent quantities such as velocity, force, acceleration, and displacement. Vector is used in physics and engineering for computing physical quantities. Vector is also used in computer graphics for representing shapes, lines, and curves. Vector can also be used in economics for representing stocks and bonds.
The vector t is the direction vector of the parametric function r(t). It is found by taking the derivative of the parametric equation:
t = (2t, 2t^2, 1)
The normal vector n is found by taking the cross product of the curvature vector and the direction vector. The curvature vector is found by taking the second derivative of the parametric equation.
k = (2, 4t, 0)
n = (4t, -2, 2)
The binormal vector b is found by taking the cross product of the direction vector and the normal vector.
b = (-8t, 4, -4t)
At the given point, (4, 16/3 , -2), the vectors t, n, and b are (2, 4, -1), (16, -8, 4), and (-32, 8, 8), respectively.
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help me please!!! i will give brainliest
The linear equation on the graph is the one in the last option, it is:
y = 6x
Which equation is the graphed one?A general linear equation can be written as:
y = a*x + b
Where a is the slope and b is the y-intercept.
First, we can see that the line passes through the point (0, 0), thus the y-intercept is b = 0.
We can write:
y = a*x
We also can see that the line passes through the point (1, 6)
Replacing these values we will get:
6 = a*1
6/1 = a
6 = a
Then the linear equation is:
y = 6x
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Can anyone help me with this question?
Answer:
A. Yes, opposite sides are congruent.
Step-by-step explanation:
For B, you can't necessarily tell if they are right angles because there is nothing indicating that it is. For C, just because angle measures aren't given doesn't mean that they aren't congruent. For D, sure it could be a rhombus although it doesn't look like it but rhombuses' are parallelograms.
Use the graphs to evaluate the expressions below.
Answer:
[tex]f(g(4) = \boxed{\bold{0}}[/tex]
[tex]g(f(3)) = \boxed{\bold{2}}[/tex]
[tex]f(f(5)) = \boxed{\bold{5}}[/tex]
[tex]g(g(1)) = \boxed{\bold{4}}[/tex]
Step-by-step explanation:
All the expressions are composite functions where the output of one function is fed as input to the other function to get the composite output
To explain better, I will use the specific values and the graphs of f(x) and g(x)
-----------------------------------------------------------------------------------------------------
f(g(4))
Let's take the first expression [tex]\displaystyle {f(g(4))}[/tex]. The innermost function, [tex]g(x)[/tex] is first evaluated at [tex]x = 4[/tex], then this value is used to find the value of the outer function [tex]f(x)[/tex]
To find the value of this expression
Look at the [tex]g(x)[/tex] graph on the right, find out the value for g(4). On this graph we see that when x = 4, [tex]g(x)[/tex] is 3.-----------------------------------------------------------------------------------------------------
The other expressions can be evaluated using similar reasoning.
g(f(3))
First evaluate[tex]f(x) \:at\: x = 3 == > f(3) = 0 == > g(0) = 2[/tex]
Answer: 2
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f(f(5))
This is a function which is a composite of itself
Find [tex]f(5) = 2 == > f(2) = 5[/tex]
Answer: 5
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g(g(1))
[tex]g(1) = 5 == > g(5) = 4[/tex]
Answer: 4
