The probability that a random sample of 289 students will have a mean score of more than 621 is 0.0869. The probability that a random sample of 289 students will have a mean score of less than 595 is 0.1597.
To answer this question, we need to use the central limit theorem. The central limit theorem states that the distribution of sample means approaches a normal distribution as the sample size increases. In this case, the sample size is 289 students.
First, we need to calculate the standard error of the mean. The standard error of the mean is the standard deviation of the distribution of sample means. It is calculated as:
SE = σ/√n
Where σ is the standard deviation of the population and n is the sample size. In this case, σ = 187 and n = 289. So, the standard error of the mean is:
SE = 187/√289 = 11.04
Next, we need to calculate the z-score for each of the two scenarios. The z-score is a measure of how many standard deviations away from the mean a data point is. It is calculated as:
z = (x - μ)/SE
Where x is the data point, μ is the population mean, and SE is the standard error of the mean. In the first scenario, x = 621, μ = 606, and SE = 11.04. So, the z-score is:
z = (621 - 606)/11.04 = 1.36
In the second scenario, x = 595, μ = 606, and SE = 11.04. So, the z-score is:
z = (595 - 606)/11.04 = -0.996
Now, we can use the z-score to find the probability. The probability that a random sample of 289 students will have a mean score of more than 621 is:
P(z > 1.36) = 0.0869
The probability that a random sample of 289 students will have a mean score of less than 595 is:
P(z < -0.996) = 0.1597
So, the probability that a random sample of 289 students will have a mean score of more than 621 is 0.0869 (rounded to four decimal places) and the probability that a random sample of 289 students will have a mean score of less than 595 is 0.1597 (rounded to four decimal places).
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15. Determine by inspection whether the given sets are linearly dependent. a) \( \left\{\left[\begin{array}{l}1 \\ 3\end{array}\right],\left[\begin{array}{l}2 \\ 6\end{array}\right]\right\} \) b) \( \
a) is linearly dependent and set b) is linearly independent.
By inspection, we can determine whether the given sets are linearly dependent by looking at the relationship between the vectors in each set. If one vector can be written as a linear combination of the other vectors in the set, then the set is linearly dependent.
For set a) \( \left\{\left[\begin{array}{l}1 \\ 3\end{array}\right],\left[\begin{array}{l}2 \\ 6\end{array}\right]\right\} \), we can see that the second vector is simply 2 times the first vector. This means that the second vector can be written as a linear combination of the first vector, and therefore the set is linearly dependent.
For set b) \( \left\{\left[\begin{array}{l}1 \\ 0 \\ 0\end{array}\right],\left[\begin{array}{l}0 \\ 1 \\ 0\end{array}\right],\left[\begin{array}{l}0 \\ 0 \\ 1\end{array}\right]\right\} \), we can see that none of the vectors can be written as a linear combination of the other vectors in the set. This means that the set is linearly independent.
Therefore, by inspection, we can determine that set a) is linearly dependent and set b) is linearly independent.
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A hardcover book sells for 1995 php in an online bookstore. The royalties paid to the author is based on the following scheme: 5% on the first 3,000 copies sold, and 15% on any additional copies. When the 5,000th book is sold, how much will the author have received? A. 897, 750Php B. 299, 250Php C. 598, 500Php D. 1,496,250Php
The correct answer is B. 299,250Php.
To find out how much the author will have received when the 5,000th book is sold, we need to calculate the royalties for the first 3,000 copies and then the royalties for the additional 2,000 copies.
For the first 3,000 copies, the author will receive 5% of the sale price:
3,000 x 1995Php x 0.05 = 299,250Php
For the additional 2,000 copies, the author will receive 15% of the sale price:
2,000 x 1995Php x 0.15 = 598,500Php
Adding these two amounts together gives us the total amount the author will have received:
299,250Php + 598,500Php = 897,750Php
Therefore, the correct answer is B. 299,250Php.
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Solve for w |w|-20=-13 If there is more than one solution, If there is no solution, click on "No
w |w|-20=-13
w = 7 and w = -33
A. For this equation, we have to solve for the absolute value of w.
An absolute value equation can be thought of as two equations in one, so we need to solve for both cases.
B.
Case 1: w > 0
w - 20 = -13
w = 7
Case 2: w < 0
w + 20 = -13
w = -33
Therefore, the solution to this absolute value equation is w = 7 and w = -33.
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A teacher gives out a variety of chocolate bars as a prize for students who correctly explain their answer.Cole randomly selects a candy from the bag what is the probability that the selected chocolate will be either cookies and cream or peanut butter cups
Answer:
1/4
Step-by-step explanation:
A table of values for a one-to-one function is given. Find the
indicated value.
x
1
2
3
4
5
6
f(x)
7
9
3
0
4
1
f −1(0) =
The inverse of a function, denoted f^-1(x), is a function that "undoes" the original function. In other words, if f(x) = y, then f^-1(y) = x.
To find the inverse of a function from a table of values, we simply switch the x and y values. So, for the given table of values:
x | 1 | 2 | 3 | 4 | 5 | 6
---|---|---|---|---|---|---
f(x) | 7 | 9 | 3 | 0 | 4 | 1
The inverse function f^-1(x) would have the table of values:
x | 7 | 9 | 3 | 0 | 4 | 1
---|---|---|---|---|---|---
f^-1(x) | 1 | 2 | 3 | 4 | 5 | 6
Now, to find f^-1(0), we simply look for the value of x that corresponds to f^-1(x) = 0. From the table, we can see that f^-1(0) = 4.
Therefore, the answer is f^-1(0) = 4.
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Solve the trangle using the Law of Sines. (Assume
D=10,∠A=30 4
, and,
C=120 4
, Alound the lengths to two decimal places.)
a=
c=
i=
The triangle solved using the Law of Sines. D=10,∠A=30 4, and, C=120 4 where a = 5.77 c = 10 i = 30°
To solve the triangle, we need to use the formula:
a/sinA = b/sinB = c/sinC
Given that D=10, ∠A=30°, and C=120°, we can plug in these values into the formula and solve for the unknown sides:
a/sin30° = 10/sin120°
Cross-multiplying and solving for a gives us:
a = 10*sin30°/sin120°
a = 5.77
Similarly, we can solve for the other unknown side, c:
c/sinC = 10/sin120°
c = 10*sinC/sin120°
c = 10*sin120°/sin120°
c = 10
Finally, we can solve for the unknown angle, i, using the fact that the sum of the angles in a triangle is 180°:
i = 180° - 30° - 120°
i = 30°
Therefore, the solution to the triangle is:
a = 5.77
c = 10
i = 30°
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Pat needs to bring 144 cookies to her friend's party. She has already baked x cookies. Write an algebraic expression for the number of cookies Pat still needs to bake.
The algebraic expression indicating the number of cookies remaining to be baked is 144 - x.
To find the number of cookies Pat still needs to bake, we need to subtract the number of cookies she has already baked from the total number of cookies she needs to bring to the party. In this case, the total number of cookies is 144 and the number of cookies she has already baked is represented by the variable x.
Therefore, the algebraic expression for the number of cookies Pat still needs to bake is:
144 - xThis expression tells us that to find the number of cookies Pat still needs to bake, we need to subtract the number of cookies she has already baked (x) from the total number of cookies she needs to bring (144).
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Need help with the problem
For the number of checks written greater than 42.5, a checking account at Long's Bank will generate more earnings income than one at Fellow's Bank.
What is range of checks?Range of checks refers to a specific interval or set of values within which the number of checks written is included or applicable.
It is usually used in the context of analyzing financial data related to checking accounts, transactions, or other monetary activities.
To find the range of checks for which Long's Bank generates more earnings income than Fellow's Bank, we need to compare the two equations and solve for x.
I(Long's Bank) > I(Fellow's Bank)
-0.06x + 8.3 > -0.02x + 6.6 (Substitute the values of I for both banks)
0.04x > 1.7 (Simplify by combining like terms)
x > 42.5 (Divide both sides by 0.04 and reverse the inequality sign)
For the number of checks written less than or equal to 42.5, a checking account at Fellow's Bank will generate more earnings income.
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2. (a) State the fundamental theorem of_Group Hormomorphisms. Let (R, +) and (C, +) be the additive group of real numbers and the additive group of complex numbers respectively. The function Φ : C -> R is defined by Φ(x +iy) = y for all : x + iy € C. (i) Show that o is a homomorphism. (ii) Find ker Φ. (iii) Prove that c/r ~= R. (b) Let G = D6 = {1,r,r^2, s, sr, sr^2) and S = {1,r^2}. Find C_G(S).
(a) (i) Φ((x + iy) + (u + iv)) = Φ((x + u) + (y + v)i) = y + v
Φ(x + iy) + Φ(u + iv) = y + v
Since these two expressions are equal, Φ is a homomorphism.
(ii) Φ(x + iy) = 0
y = 0
(iii) The image of Φ is the set of all real numbers, we have C/R ~= R.
(b) The centralizer of S in G is the set {1, r^2}.
This means that the kernel of Φ is the set of all complex numbers with an imaginary part of 0, which is the set of all real numbers. That is, ker Φ = R.
The fundamental theorem of Group Hormomorphisms states that for any group homomorphism Φ: G -> H, the kernel of Φ, ker Φ, is a normal subgroup of G, and the image of Φ, im Φ, is a subgroup of H. Furthermore, G/ker Φ is isomorphic to im Φ.
(a) (i) To show that Φ is a homomorphism, we need to show that it preserves the group operation. That is, for any two elements x + iy and u + iv in C, we need to show that Φ((x + iy) + (u + iv)) = Φ(x + iy) + Φ(u + iv). Using the definition of Φ, we have:
Φ((x + iy) + (u + iv)) = Φ((x + u) + (y + v)i) = y + v
Φ(x + iy) + Φ(u + iv) = y + v
Since these two expressions are equal, Φ is a homomorphism.
(ii) The kernel of Φ, ker Φ, is the set of all elements in C that are mapped to the identity element in R, which is 0. That is, ker Φ = {x + iy : Φ(x + iy) = 0}. Using the definition of Φ, we have:
Φ(x + iy) = 0
y = 0
This means that the kernel of Φ is the set of all complex numbers with an imaginary part of 0, which is the set of all real numbers. That is, ker Φ = R.
(iii) To prove that C/ker Φ is isomorphic to R, we can use the fundamental theorem of Group Hormomorphisms. Since ker Φ = R, we have C/R ~= im Φ. Since the image of Φ is the set of all real numbers, we have C/R ~= R.
(b) The centralizer of a subset S of a group G, denoted by C_G(S), is the set of all elements in G that commute with every element in S. That is, C_G(S) = {g : g in G, gs = sg for all s in S}. For the given groups G = D6 and S = {1,r^2}, we have:
C_G(S) = {g : g in G, g1 = 1g and gr^2 = r^2g}
= {g : g in G, g = g and gr^2 = r^2g}
= {1, r^2}
Thus, the centralizer of S in G is the set {1, r^2}.
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Find 3 ratios that are equivalent to the given ratio 7:11
hi, attached is the answer
Hope this helps:)
To thank her five volunteers, Mai gave each of them the same number of stickers. Then she gave them each two more stickers. Altogether, she gave them a total of 30 stickers.
"explain plsss"
Answer:
30 = 2x + 4
Step-by-step explanation:
2x5= 10
30- 10 = 20
20/5= 4
4+2 = 6
Mei gave each student 6 stickers
Roxanne brought chocolate and vanilla cupcakes to school for her birthday. 50 students decided to take a cupcake, and 25 of them picked vanilla. What percentage of the students picked a vanilla cupcake?
Answer:
50%.
Step-by-step explanation:
If 25 students picked vanilla, then it is 50%. This is because 25 is half of 50.
Solve the following system of equations and show all work.
y = −x^2 + 4
y = 2x + 1
Please explain how you got the answer!
If you do, I will give you brainiest.
The solution to the system of equations: x = 1 and y = 3
How to solve the system of equationsWe have that the equations are;
y = −x^2 + 4 (1)
y = 2x + 1 (2)
Now, equate the two equations, we get;
-x² + 4 = 2x + 1
collect the like terms
-x² - 2x + 4 - 1
subtract the values
-x² - 2x + 3
Make into standard form
x² + 2x - 3 = 0
Solve the quadratic equation
Find the pair factors of -3 that sums up to 2, we have;
x² +3x - x - 3 = 0
factor the terms
x(x + 3) - 1(x + 3) = 0
(x - 1) = 0
Make 'x' the subject
x = 1
x + 3 = 0
x = -3
Then, y = 2(1) + 1 = 3
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What is the x-coordinate of the midpoint of line segment AB with points A(13, 5) and B(46, -13).
The x-coordinate of the midpoint of line segment AB is 29.5
What is coordinate?
A coordinate system is a method for determining how to position points or other geometrical objects on a manifold, such as Euclidean space, uniquely using one or more integers, or coordinates.
To find the x-coordinate of the midpoint of line segment AB, we can use the midpoint formula:
Midpoint x-coordinate = (x-coordinate of A + x-coordinate of B) / 2
We are given the coordinates of points A and B:
A(13, 5) and B(46, -13)
Using the midpoint formula, we can substitute the x-coordinates of A and B into the formula and simplify:
Midpoint x-coordinate = (13 + 46) / 2
= 29.5
Therefore, the x-coordinate of the midpoint of line segment AB is 29.5
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Since a line passes through the origin, the equation is in the form y=ax. Since the graph passes through the point (1,3), if we substitute x=1 and y=3 into y=ax, then what does a equal
When the point (1, 3) is substituted in the equation y = ax, then 'a' i,e slope of the line is 3
Equation of the line passes through origin:If a line passes through the origin, its equation can be written in the form y = mx, where m is the slope of the line.
The slope of a line passing through the origin is the ratio of the change in y to the change in x between any two points on the line.
Here we have
A line passes through the origin, the equation is in the form y = ax
Given that y = ax passes throgh (1, 3)
So substitute x = 1 and y = 3
=> 3 = a(1)
=> a = 3/1
=> a = 3
Therefore,
When the point (1, 3) is substituted in the equation y = ax, then 'a' i,e slope of the line is 3.
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What is the distance between the points (13 , -18) and (-10 , -18) in the coordinate plane?
what is the answer
Answer:
23
Step-by-step explanation:
You select a star without looking and then put it back. If you do this 16 times, what is the prediction for the number of times you will pick a star that is not yellow?
The predictiοn fοr the number οf times yοu will pick a star that is nοt yellοw is 0.999.
What is the prοbability?Prοbability is the study οf the chances οf οccurrence οf a result, which are οbtained by the ratiο between favοrable cases and pοssible cases.
Assuming that the stars cοme in οnly three cοlοrs (yellοw, red, and blue), and each cοlοr has an equal chance οf being selected, then the prοbability οf picking a star that is nοt yellοw is 2/3, and the prοbability οf picking a yellοw star is 1/3.
If we dο this experiment 16 times, we can use the binοmial prοbability fοrmula tο find the prοbability οf picking a nοn-yellοw star a certain number οf times:
[tex]\mathrm{P(x) = (n \ choose \ x) \times ^x \times (1-p)^{(n-x)}}[/tex]
where n is the number οf trials, x is the number οf times we want tο pick a nοn-yellοw star, p is the prοbability οf picking a nοn-yellοw star (2/3), and (1-p) is the prοbability οf picking a yellοw star (1/3).
Using this fοrmula, we can calculate the prοbability οf picking a nοn-yellοw star exactly 1 time, exactly 2 times, and sο οn, up tο 16 times. We can then add up these prοbabilities tο get the οverall prοbability οf picking a nοn-yellοw star at least οnce in 16 trials.
Alternatively, we can use the cοmplement rule tο find the prοbability οf picking a yellοw star in all 16 trials, and subtract this frοm 1 tο get the prοbability οf picking a nοn-yellοw star at least οnce:
P(nοn-yellοw at least οnce) = 1 - P(yellοw in all 16 trials)
= 1 - (1/3)¹⁶
≈ 0.999
Hence, the predictiοn fοr the number οf times yοu will pick a star that is nοt yellοw is 0.999.
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Our local movie theater polls its customers about their favorite candy to eat during the movie. Name each sampling method described.
a. Employees ask every 45th customer that purchases a movie ticket:
b. An employee divides the theater into sections: left, right, front, back. He/she randomly chooses a section and polls every customer within that section:
The sampling method of (a) is systematic sampling, and (b) is cluster sampling.
What is the sampling method?It is an advanced form of simple random sampling. In this form, from the population of members, sample members are selected randomly. In this random selection, a starting point is fixed. The sample is created when the members are selected from the fixed intervals.
a. The sampling method described is systematic sampling, where every 45th customer that purchases a movie ticket is selected for the survey.
b. The sampling method described is cluster sampling, where the theater is divided into sections (clusters) and one cluster is randomly selected for the survey. Then, every customer within that cluster is polled.
Therefore, the sampling method of (a) is systematic sampling, and (b) is cluster sampling.
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Factor completely. Enter the factors as a product of two binomial 9n^(4)-16p^(2)
To factor the expression[tex]9n^(4)-16p^(2)[/tex], we need to recognize that it is a difference of squares. A difference of squares can be factored into the product of two binomials, one with a sum and one with a difference. In this case, we can factor [tex]9n^(4)-16p^(2)[/tex] into [tex](3n^(2)+4p)(3n^(2)-4p)[/tex].
The final factored form of [tex]9n^(4)-16p^(2)[/tex] is [tex](3n^(2)+4p)(3n^(2)-4p).[/tex]
So, the factors of the expression are the two binomials [tex](3n^(2)+4p[/tex]) and [tex](3n^(2)-4p)[/tex].
Here is the step-by-step explanation:
1. Recognize that the expression is a difference of squares.
2. Write the expression as the product of two binomials, one with a sum and one with a difference.
3. Simplify the binomials if necessary.
4. The final factored form is [tex](3n^(2)+4p)(3n^(2)-4p).[/tex]
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Match the expression to the exponent rule. One rule will not be used.
Answer:
Step-by-step explanation:
from top down:
xᵃ⁻ᵇ
xᵃ⁺ᵇ
1
xᵃˣᵇ
1/xᵃ
12. In a library, 50% of total number of books is of Marathi. The books of English are 3 1 rd of Marathi books. The books on mathematics are 25% of the English books. The remaining 560 books are of other subjects. What is the total number of books in the library?
Total number of books in the library 1920
What is linear equation in one variable ?The linear equations in one variable is an equation which is expressed in the form of ax+b = 0, where a and b are two integers, and x is a variable and has only one solution.
Let the total number of books be x
50 % of the total books are of Marathi = x*50/100 = x/2
Books of English are 1/3rd of Marathi = (x/2)*(1/3)
= x/6
Books on Mathematics are 25 % of the English books = (x/6)*(25/100)
= x/24
Remaining books = 560
Now, according to the question.
⇒ x/2 + x/6 + x/24 + 560/1 = x/1
⇒ (12x + 4x + x + 13440)/24 = x/1
⇒ 17x + 13440 = 24x
⇒ 24x - 17x = 13440
⇒ 7x = 13440
⇒ x = 13440/7
⇒ x = 1920
So, there are 1920 books in the the library.
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6.
Erin and Christa were working on cubing
binomials for math homework. Erin believed they
could save time with a shortcut. She wrote down
the rule below for Christa to follow.
(a + b)³ = a³ + b³
Does Erin's shortcut always work? Justify your
result algebraically.
PLEASE SHOW WORK
If Erin and Christa were working on cubing binomials for math homework. Erin's shortcut does not always work and should not be used.
Does Erin's shortcut always work?Erin's shortcut is not correct. To see why, let's expand (a+b)³ using the binomial theorem: :
(a+b)³ = (a+b)(a+b)(a+b)
= (a+b)(a²+2ab+b²)
= a³ + 2a²b + ab² + a²b + 2ab² + b³
= a³ + 3a²b + 3ab² + b³
So the correct expansion of (a+b)³ has four terms, not two as Erin's shortcut suggests. Therefore, Erin's shortcut does not always work and should not be used.
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The diagram shows a triangle.
36°
31°
W-24°
What is the value of w?
Really will appreciate it
Answer:
w=137°
Step-by-step explanation:
mark as brainliest
Please use this function machine to answer the following question: If 3 was an input into Bucky's function machine, what would the output be of Badger's function machine?
The output of Badger's function machine when the input is 3.
To find the output of Badger's function machine, we need to first find the output of Bucky's function machine when the input is 3.
1. Input 3 into Bucky's function machine.
2. Follow the instructions on the function machine to find the output.
3. Input the output from Bucky's function machine into Badger's function machine.
4. Follow the instructions on Badger's function machine to find the final output.
Without knowing the specific instructions on the function machines, it is impossible to give a specific answer.
However, by following these steps, you can find the output of Badger's function machine when the input is 3.
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Are the ratios 3:6 and 2:4 equivalent? ) yes no
Answer:
Yes, the ratios 3:6 and 2:4 are equivalent because they represent the same proportion. To confirm, we can simplify both ratios to their simplest form:
3:6 can be simplified by dividing both terms by 3: 3/3 : 6/3 -> 1:2
2:4 can be simplified by dividing both terms by 2: 2/2 : 4/2 -> 1:2
Since both ratios simplify to the same ratio, 1:2, they are equivalent.
Answer: yes !!
Step-by-step explanation: 3:6 and 2:4 are equivalent b/c of their common factors.
Find the the measure of ktr give some explanation
We're required to find the value of angle KTR.
It can easily be seen that angle KTR and angle BTF are vertically opposite angles.
Vertically opposite angles are the angles formed due to intersection of two lines and they are equal in measure.[tex]\therefore \: \angle \: KTR= \angle \: BTF \: \\ \implies \: 4h + 160 = 3h + 156 \\ grouping \: the \: like \: terms \: at \: either \: sides \\ \implies \: 4h - 3h = 156 - 160 \\ \implies \: \boxed{h = - 4\degree}[/tex]
now ,
[tex]\angle \: KTR \: = 4h + 160 \\ \implies \: \angle \:KTR \: = 4( - 4) + 160 \\ \implies \: \angle \: KTR \: = - 16 + 160 \\ \implies \:\boxed{ \angle \:KTR = 144\degree}[/tex]
hope helpful! :)
question. Question 14 When simplifying the following expression, the first step would be to add eight and two. 5-8+2 True False
The given statement "When simplifying the expression 5-8+2, the first step would be to add eight and two" is false because of the PEMDAS rule.
According to the order of operations (PEMDAS), we need to perform any calculations inside parentheses first, then exponents, then multiplication and division from left to right, and finally addition and subtraction from left to right.
In this case, there are no parentheses or exponents, so we can move on to addition and subtraction from left to right.
The first step would actually be to subtract 8 from 5, giving us -3. Then we would add 2 to -3, giving us a final answer of -1.
Therefore, the correct answer is False.
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Ou roll a number cube. Determine the theoretical probability of the event. Rolling a 8
On a roll of a number cube, the theoretical probability of the event of rolling a 8 is 0.
The Theoretical Probability is defined as the likelihood of an event occurring based on all possible outcomes in a given situation.
The theoretical probability is determined by dividing the number of ways the event can occur by the total number of possible outcomes.
The theoretical probability of rolling a specific number on a fair, six-sided number cube is 1/6, because there are 6 equally likely outcomes which are the numbers 1 to 6,
So, the theoretical probability of rolling an 8 on a number cube is 0 or 0%, because an 8 is not one of the possible outcomes when rolling a standard, six-sided number cube.
Therefore, the required probability is 0.
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Please help me on this question
Answer:
C) 84 mm squared
Step-by-step explanation:
The formula for finding area of a triangle is 1/2 times base times height, so substitute and solve for the answer
1/2 times 8 times 21
4 times 21
84
A linear equation that is equivalent to the equation 0=-7 is a conditional equation.
No, a linear equation that is equivalent to the equation 0=-7 is not a conditional equation. Instead, it is an inconsistent equation.
A conditional equation is an equation that is only true for certain values of the variable. For example, the equation 2x+3=7 is a conditional equation because it is only true when x=2.
An inconsistent equation, on the other hand, is an equation that has no solution. The equation 0=-7 is an example of an inconsistent equation because there is no value of x that will make the equation true.
Therefore, a linear equation that is equivalent to the equation 0=-7 is an inconsistent equation, not a conditional equation.
You can learn more about linear equations at: brainly.com/question/11897796
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