11. What is the solution of the equation x2 + 8x = 4?*=-4+ 215x=-4 1415x=-40215*--45v2
The equation given,
\(x^2+8x=4\)Rearranging,
\(x^2+8x-4=0\)Comparing to general form of a quadratic, we have:
\(\begin{gathered} a=1 \\ b=8 \\ c=-4 \end{gathered}\)Using the quadratic formula, we can find x.
\(\begin{gathered} x=\frac{-b\pm\sqrt[\square]{b^2-4ac}}{2a} \\ x=\frac{-8\pm\sqrt[\square]{(8)^2-4(1)(-4)}}{2(1)} \\ x=\frac{-8\pm\sqrt[\square]{80}}{2} \\ x=\frac{-8\pm4\sqrt[]{5}}{2} \\ x=-4\pm2\sqrt[\square]{5} \end{gathered}\)AnswerFirst answer choice
some adults and children are watching a musical there are n children there are 25 fewer adults
According to the concept of algebraic expression and arithmetic, the correct answers are A) Number of adults = N - 25. B) Number of adults when N = 124: 124 - 25 = 99
A) Let's denote the number of children as N. Since there are 25 fewer adults than children, the number of adults can be expressed as N - 25.
B) If there are 124 children, we substitute N with 124 in the expression from part A. Thus, the number of adults would be 124 - 25 = 99.
To arrive at these answers, we used the given information that there are "N" children and 25 fewer adults than children. By substituting the value of N, we determined the number of adults in terms of N and then calculated the specific number of adults when N is equal to 124.
Note: The given question is incomplete. The complete question is:
Some adults and children are watching a musical. there are 'N' number of children. There are 25 fewer adults than children.
A) find the number of adults in terms of 'N'.
B) if there are 124 children how many adults are there?
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Suppose that Ina is a typical woman and Ted is a typical man. Based on the research discussed in the textbook, which of the following is most likely to be true?
The most likely to be discussed in a feminist criticism of Chinua Achebe's work is his portrayal of gender roles and Ina is a typical woman . The correct option is 2.
What is a novelist person?
A novelist is a person who writes novels. The key to success as a romantic novelist is absolute belief in your story. Synonyms: author, writer More Synonyms of novelist
Who is Chinua Achebe?
Chinua Achebe is a novelist and poet. He is famous for his pivotal direction in literature of Africa. His first novel was Things fall apart.
The options are attached here:
his life story and literary achievements
his portrayal of gender roles
his descriptions of the landscape
his literary influences and preferences
Thus, the correct option is 2. his portrayal of gender roles.
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For two n by n square matricies A and B,
suppose rankA = rankB = n-1.
Can rank(AB) become less than n-1 ?
(e.g. rank (AB) = n-2)
If so, I humbly ask you for an example.
Thank you very much.
No, the rank of the product of two n by n square matrices A and B, denoted as AB, cannot be less than n-1 if both A and B have ranks of n-1.
According to the Rank-Nullity theorem, for any matrix M, the sum of its rank and nullity is equal to the number of columns in M. In this case, the number of columns in AB is n, so the sum of the rank and nullity of AB must be n.
If rank(A) = rank(B) = n-1, it means that both A and B have nullity 1. The nullity of a matrix is the dimension of its null space, which consists of all vectors that get mapped to the zero vector when multiplied by the matrix. Since both A and B have rank n-1, their null spaces consist only of the zero vector.
Now, considering AB, if the rank of AB were less than n-1, it would mean that the nullity of AB is greater than 1.
However, this would violate the Rank-Nullity theorem since the sum of the rank and nullity of AB must be n, which is the number of columns.
Therefore, if rank(A) = rank(B) = n-1, the rank of AB cannot be less than n-1.
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Evaluate x2 + 5x when x = 3
Answer:
plug in the value
x2 + 5x
(3)2 + 5(3) = 21
Answer-
multiply 3 and 2 then add 5
(3)(2)+5
=11
The owner of a deli recorded the number of customers who ordered each of four sandwiches available if the deli has 50 customers the first hour it is open predict how many customers will order turkey sandwiches
The first hour there will be 18 costumers that will order Turkey sandwiches
Probability
First, we want to find the probability of having a costumer who choose Turkey sandwich.
In order to find it, we calculate the ratio of turkey sandwiches over the total number of orders.
Turkey sandwiches: 180
Total number of orders: 160 + 100 + 180 + 60 = 500
Ratio = turkey / total
Ratio = 180 / 500 = 0.36
Then, the probability of having a costumer who choose Turkey sanwich is
P(T) = 0.36 = 36%
Secondly, in order to find the 36% of 50, we just multiply 0.36 by 50:
Hence , the first hour there will be 18 costumers that will order Turkey sandwiches
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URGENT!!!! Find the y-intercept of the line that passes through the points (-3, 7) and (3, −9).
Answer:
\(m = \frac{ - 9 - 7}{3 - ( - 3)} = \frac{ - 16}{6} = - \frac{8}{3} \)
\(7 = - \frac{8}{3} ( - 3) + b\)
\(7 = 8 + b\)
\(b = - 1\)
\(y = - \frac{8}{3} x - 1\)
The y-intercept is -1.
A square has the perimeter of 24.6m. What is the length of each of the sides?
Answer:
I believe it is 6.15
Step-by-step explanation:
hope this helps!
The triangle above has the following measures.
m
a=7.5 y
Use the 45-45-90 Triangle Theorem to find the length of the hypotenuse. Include correct units.
Show all your work.
The length of the hypotenuse is 10.61 yd.
We have,
The sum of the angles in a triangle = 180
Now,
Two angles are 45.
This means,
The side opposite to angle 45 are equal.
So,
a = c
And,
a = 7.5 yd
Now,
Applying the Pythagorean theorem.
b² = a² + c²
b² = 7.5² + 7.5²
b² = 112.5
b = √112.5
b = 10.61
Thus,
The length of the hypotenuse is 10.61 yd.
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Activity
You have also set up a card game in which a player picks a card from a standard deck of 52 cards. The player wins if these two events occur together: E1, in which the card drawn is a black card, and E2, in which the card drawn is a numbered card, 2 through 10.
Question 1
What is the probability of getting a black card and a numbered card? Calculate the probabilities P(E1) and P(E2) as fractions.
The probability of getting a black card and a numbered card is 9/26.
To calculate the probability of getting a black card (E1), we need to determine the number of black cards in a standard deck of 52 cards.
There are 26 black cards in total, which consist of 13 spades (black) and 13 clubs (black).
Therefore, the probability of drawing a black card (P(E1)) is:
P(E1) = Number of favorable outcomes / Total number of possible outcomes
P(E1) = 26 / 52
Simplifying this fraction, we get:
P(E1) = 1/2
So the probability of drawing a black card is 1/2.
To calculate the probability of drawing a numbered card (E2), we need to determine the number of numbered cards (2 through 10) in a standard deck.
Each suit (spades, hearts, diamonds, clubs) contains one card for each numbered value from 2 to 10, totaling 9 numbered cards per suit.
Therefore, the probability of drawing a numbered card (P(E2)) is:
P(E2) = Number of favorable outcomes / Total number of possible outcomes
P(E2) = 36 / 52
Simplifying this fraction, we get:
P(E2) = 9/13
So the probability of drawing a numbered card is 9/13.
To calculate the probability of both events occurring together (getting a black card and a numbered card), we multiply the individual probabilities:
P(E1 ∩ E2) = P(E1) × P(E2)
P(E1 ∩ E2) = (1/2) × (9/13)
Simplifying this fraction, we get:
P(E1 ∩ E2) = 9/26
Therefore, the probability of getting a black card and a numbered card is 9/26.
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Find the equation of the line passing through (4,1) and perpendicular to the line whose equation is 1x-3y-4=0
9514 1404 393
Answer:
3x +y -13 = 0
Step-by-step explanation:
The perpendicular line will have the variable coefficients swapped and one of them negated. The new constant will be appropriate to the given point.
3(x -4) +1(y -1) = -0
3x +y -13 = 0
_____
Additional comment
The given equation is in "general form", so that is the form of the equation we have given as the answer. This form is convenient in that the general form equation for a line through the origin, ax+by=0, is easily translated to make it pass through a point (h, k): a(x -h) +b(y -k) = 0. Eliminating parentheses puts the equation back into general form.
Ejhdhdtdgrgrgrgrhrhff
Answer:
x = 4Step-by-step explanation:
4x + 8 = 7x - 4 =
4x - 7x = -8 + (-4)
- 3x = -12
x = 4
-----------------
check4 * 4 + 8 = 7 * 4 - 4
24 = 24
the answer is good
I need help please ASAP
Answer: C
Step-by-step explanation:
120 plus 80 equals 200.
Using a two-tailed test with an alpha of 0.05, a research reports an obtained Z-score of -2. The researcher should reject the null
hypothesis.
True
False
Since the absolute value of the z-score is greater than the critical value, the statement is true.
When do we reject or do not reject the null hypothesis?For a two-tailed test:
If the absolute value of the test statistic is less than the critical value, we do not reject the null hypothesis.If it is more, we reject.The critical value for a two-tailed test with \(\alpha = 0.05\) is of |z| = 1.96.
In this problem, we have that Z = -2, hence |Z| = 2, which is greater than the critical value, hence we reject the null hypothesis and the statement is True.
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During the summer months, the water level in Marta's pool decreases by about 1/2 inch each day due to evaporation. Which equation shows the approximate total change, in inches, to the water level in her pool after 30 summer days?
Answer: 15.
Step-by-step explanation:
Total decrease = decrease per day × number of days.
The decrease per day is 1/2 and the number of days is 30.
So, we can multiply 30 × 1/2 = 15.
The final water level will depend on the initial water level in the pool.
Hopes this helps!
Which expression is equivalent to 4(y + 2) ? to
Answer:
4y+8
Step-by-step explanation:
Answer:4y+8
Step-by-step explanation:
To find an equivalent expression you can just simplify this expression by multiplying the numbers in the parentheses by 4. 4y+8
6x +30=-6 please explain what x is equal to
Choose the equation for the graph.
Answer:
B. y = -|x - 2| + 5
Step-by-step explanation:
Here the parent function is |x|. It is flipped and translated upward by 5 units and shifted to the right by 2 units.
y = - |x - 2| + 5
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One positive integer is 1 less than twice another. The sum of their squares is 34. Find the integers.
Let's define the following variable.
x = first integer
y = second integer
If the sum of their squares is 34, then we can form the equation below:
\(x^2+y^2=34\)If the other integer, say x, is 1 less than twice the other (y), then we can form this second equation:
\(x=2y-1\)From these two equations, we can now solve for the values of x and y.
Here are the steps.
1. Replace the value of "x" in equation 1 using the value in equation 2.
\((2y-1)^2+y^2=34\)2. Apply the exponent.
\(\begin{gathered} (4y^2-4y+1)+y^2=34 \\ 4y^2-4y+1+y^2=34 \end{gathered}\)3. Rearrange the terms. Subtract 34 on both sides of the equation then, combine similar terms.
\(\begin{gathered} 4y^2+y^2-4y+1=34 \\ 4y^2+y^2-4y+1-34=34-34 \\ 5y^2-4y-33=0 \end{gathered}\)In step3, we are able to create a quadratic equation in a standard form that is ax² + bx + c wherein a = 5, b = -4, and c = -33.
To solve for the value of y, we can use the Quadratic formula.
\(y=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}\)Since we have already determined the values of a, b, and c, let's plug them into the formula above.
\(y=\frac{-(-4)\pm\sqrt[]{(-4)^2-4(5)(-33)}_{}}{2(5)}\)Then, solve for y.
\(\begin{gathered} y=\frac{4\pm\sqrt[]{16+660}}{10} \\ y=\frac{4\pm\sqrt[]{676}}{10} \\ y=\frac{4\pm26}{10} \end{gathered}\)Separate the plus and minus signs.
\(\begin{gathered} y=\frac{4+26}{10}=\frac{30}{10}=3 \\ y=\frac{4-26}{10}=-\frac{22}{10}=-2.2 \end{gathered}\)There are two possible values y but only one is an integer. So, we will use y = 3.
To solve for the other integer x, let's use the second equation plugin y = 3.
\(\begin{gathered} x=2y-1 \\ x=2(3)-1 \\ x=6-1 \\ x=5 \end{gathered}\)Therefore, the integers are 5 and 3.
Closing prices of two stocks are recorded for 50 trading days. The sample standard deviation of stock X is 4.668 and the sample standard deviation of stock Y is 8.006. The sample covariance is $36.109. (a) Calculate the sample correlation coefficient. (Round your answer to 4 decimal places.) Correlation coefficient (b) Describe the relationship between prices of these two stocks. There is no correlation between the two stock prices. rev: 02_19_2019_QC_CS-159277
Answer:
0.9662 ;
There is a strong positive relationship between the stocks.
Step-by-step explanation:
Given :
Standard deviation of stock X = 4.668
Standard deviation of stock Y = 8.006
Covariance of sample = 36.109
The Correlation Coefficient, r :
(Covariance of Sample (X, Y)) ÷ (standard deviation of X * Standard deviation of Y)
r = 36.109 / (4.668 * 8.006)
r = 36.109 / 37.372008
r = 0.9662
Given the value of the correlation Coefficient, we can infer that there is a strong positive relationship between the two stocks, (X, Y). That is Stock X increases as stock Y increases and vice versa.
Consider this equation
1/x-1 = | x-2 |
Using three iterations of successive approximation, what is the approximate solution to the equation? Use the graph as a starting point.
A. x ≈ 43/16
B. x ≈ 21/8
C. x ≈ 41/16
D. x ≈ 19/8
The approximate solution to the equation 1/x-1 = |x-2| after three iterations of successive approximation is x ≈ 5/2 or x ≈ 2.5.
To solve the equation 1/x-1 = |x-2| using three iterations of successive approximation, we will start with an initial guess and refine it using an iterative process.
Given that the equation involves absolute value, we will consider two cases:
Case 1: x - 2 ≥ 0
In this case, |x-2| simplifies to x-2, and the equation becomes 1/(x-1) = x-2.
Case 2: x - 2 < 0
In this case, |x-2| simplifies to -(x-2), and the equation becomes 1/(x-1) = -(x-2).
Now, let's perform the successive approximation:
Iteration 1:
Let's start with an initial guess, x = 2.
Case 1: When x - 2 ≥ 0,
1/(2-1) = 2-2,
1/1 = 0,
which is not true.
Case 2: When x - 2 < 0,
1/(2-1) = -(2-2),
1/1 = 0,
which is not true.
Since our initial guess did not satisfy the equation in either case, we need to choose a different initial guess.
Iteration 2:
Let's try x = 3.
Case 1: When x - 2 ≥ 0,
1/(3-1) = 3-2,
1/2 = 1,
which is not true.
Case 2: When x - 2 < 0,
1/(3-1) = -(3-2),
1/2 = -1,
which is not true.
Again, our guess did not satisfy the equation in either case.
Iteration 3:
Let's try x = 2.5.
Case 1: When x - 2 ≥ 0,
1/(2.5-1) = 2.5-2,
1/1.5 = 0.5,
which is true.
Case 2: When x - 2 < 0,
1/(2.5-1) = -(2.5-2),
1/1.5 = -0.5,
which is not true.
Our guess of x = 2.5 satisfies the equation in Case 1.
Therefore, the approximate solution to the equation 1/x-1 = |x-2| after three iterations of successive approximation is x ≈ 5/2 or x ≈ 2.5.
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what is the eight term of the arithmetic sequence defined by the rule A(n)=-12+2(n-1) RIGHT ANSWER ONLY
Answer:
a₈ = 2
Step-by-step explanation:
Substitute n = 8 into the nth term rule
A(8) = - 12 + 2(8 - 1) = - 12 + 2(7) = - 12 + 14 = 2
One of the legs of right triangle measures 16 cm and the other leg measures 2 cm.
round to the nearest tenth.
Find the measure of the hypotenuse. If necessary, round
Answer:
16.1 cm (nearest tenth)
Step-by-step explanation:
Pythagoras’ Theorem
\(a^2+b^2=c^2\)
(where a and b are the legs, and c is the hypotenuse, of a right triangle)
Given:
a = 16 cmb = 2 cmSubstitute the given values into the formula and solve for c:
\(\implies 16^2+2^2=c^2\)
\(\implies 256+4=c^2\)
\(\implies c^2=260\)
\(\implies c=\sqrt{260}\)
\(\implies c=2\sqrt{65}\)
\(\implies c=16.1 \sf \: cm\:(nearest\:tenth)\)
16.1 is rounded to the nearest tenth
The instructor noted the following scores on the last quiz of the semester for 8 students. Find the range of this data set 59,61,83,67,81,80,81,100
answer: the range is 41.
to find the range of this data set, we first need to find the minimum and maximum values - which are 59 and 100.
then we subtract the minimum from the maximum.
59 - 100 = 41.
After watching baking shows on T.V., Angie signs up for a cake-decorating class. To practice her new skills, she decorates a batch of cupcakes with sugar flowers. Angie puts 4 sugar flowers on each cupcake. In all, Angie puts 32 sugar flowers on the cupcakes.
Which equation can you use to find the number of cupcakes c Angie decorates?
Solve this equation for c to find the number of cupcakes Angie decorates.
Angie decorates 8 cupcakes after putting 4 sugar flowers on each cupcake.
To find the number of cupcakes c Angie decorates, we can use the equation:4c = 32where 'c' is the number of cupcakes Angie decorates.
4 represents the number of sugar flowers Angie puts on each cupcake, and 32 is the total number of sugar flowers Angie puts on the cupcakes.
To solve this equation for c, we need to isolate c on one side of the equation. We can do this by dividing both sides of the equation by 4. This gives us:c = 8
Therefore, Angie decorates 8 cupcakes.Here's how we get to this answer:4c = 32Divide both sides by 4 to isolate c:c/4 = 32/4c = 8
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Evaluate n + 5/5
When n= -10
Answer:
n + 5/5 = -9
Step-by-step explanation:
Answer:
see below
Step-by-step explanation:
If the problem is
(n+5) /5
Let n = -10
(-10+5)/5
-5/5
-1
or if
n+ 5/5
-10 + 1
-9
i dont understand can someone help
9514 1404 393
Answer:
FE = 10FL = 4.8Step-by-step explanation:
The given parallel lines mean that the two triangles are similar:
∆FDE ~ ∆FLK
That means corresponding sides are proportional.
FE/FK = ED/KL
FE = FK(ED/KL) = 4(15/6) = 10
and
FL/FD = KL/ED
FL = FD·KL/ED = 12(6/15) = 12(2/5) = 4.8
_____
Additional comment
Each of the diagonal lines, LD and KE, can be considered to be transversals between the parallel lines DE and KL. This means the interior angles at either end of those diagonals will be congruent. Hence the triangles are similar by the AA postulate.
students with above-average scores on exam 1 in stat 001 tend to also get above-average scores on exam 2. but the relationship is only moderately strong. in fact, a linear relationship between exam 2 scores and exam 1 scores explains only 36% of the variance of the exam 2 scores.
The correlation between Exam 1 scores and Exam 2 scores is r = .6
The standard mistake of the relapse is the typical distance that the noticed qualities tumble from the relapse line. For this situation, the noticed qualities fall a normal of 4.89 units from the relapse line. Variance is a proportion of how information focuses varies from the mean. As indicated by Layman, a difference is a proportion of how far a bunch of information (numbers) is fanned out from their mean (normal) esteem. Fluctuation means to track down the normal distinction of deviation from real worth. Hence, the correlation between Exam 1 scores and Exam 2 scores is r = .6
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(HELP THIS IS TIMED!)
Which situations can represent the expression n+2? Check all that apply.
Ramya's grade increased by two points
the difference between Escher's highest score and two
the number of chapters Wally read plus two more
two fewer than the maximum number of absences Ellie is allowed
two added to Allison's age.
the sum of Mikel's height and two
Answer:
1,3,5,6
Step-by-step explanation:
Sorry I didn't get to this in time, but if you see this, please give me brainliest, apariently I need it to get to the next answer. Thank you for your time.
A cylinder has a height of 18 cm and a diameter of 12 cm. Calculate the surface area of the cylinder. Give your answer to the nearest integer.
The surface area of the cylinder is 905 square centimeters
Finding the surface area of the cylinderFrom the question, we have the following parameters that can be used in our computation:
Diameter, d = 12 cm
Height, h = 18 m
This means that
Radius, r = 12/2 = 6 cm
Using the above as a guide, we have the following:
Surface area = 2πr(r + h)
Substitute the known values in the above equation, so, we have the following representation
Surface area = 2π * 6 * (6 + 18)
Evaluate
Surface area = 905
Hence, the surface area is 905 square centimeters
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