Answer:
a) x = {-2 2/3, -2}
b) x = {-8, 3}
c) x = {-1, 23}
Step-by-step explanation:
If all you want are solutions, a graphing calculator can give them to you easily. The attachment shows the solutions as x-intercepts when the equation is rearranged to the form f(x) = 0.
__
In general, it can be convenient to write the equation in standard form with integer coefficients. Common factors among the coefficients should be removed.
a)3(x+4)^2 = 10x +32 . . . . . given
3(x^2 +8x +16) -10x -32 = 0
3x^2 +14x +16 = 0
To factor this, we're looking for factors of 3·16 that total 14.
48 = 1·48 = 2·24 = 3·16 = 4·12 = 6·8
The last pair of factors has a total of 14, so we can rewrite the equation as ...
(3x +6)(3x +8)/3 = 0
(x +2)(3x +8) = 0
The solutions are the values of x that make the factors zero:
x = -2, x = -8/3
__
b)(x +4)^2 = 3x +40 . . . . . . . . given
x^2 +8x +16 -3x -40 = 0 . . . . subtract the right side
x^2 +5x -24 = 0 . . . . . . . . simplify
(x +8)(x -3) = 0 . . . . . . factor
The solutions are the values of x that make the factors zero:
x = -8, x = 3
__
c)(x^2 -1)/2 -11x = 11 . . . . . given
x^2 -1 -22x -22 = 0 . . . . . . multiply by 2, subtract the right side
x^2 -22x -23 = 0 . . . . . . simplify
(x -23)(x +1) = 0 . . . . . . factor
x = 23, x = -1
_____
Additional comment
Factoring often gets to the solution with the least fuss when the solutions are rational. There are several ways factoring can be done when the leading coefficient is not 1. One of them is illustrated in (a) above. We will show two other methods that give the same result.
factoring by pairs
We have identified the factors of 3·16 = 48 that have a total of 14. We can use those factors to rewrite the 14x term in the equation.
3x^2 +6x +8x +16 = 0
Now, we can group the terms in pairs, and factor each pair. It does not matter which of the factors (6 or 8) you write first. You will end with the same result.
(3x^2 +6x) +(8x +16) = 0
3x(x +2) +8(x +2) = 0
(3x +8)(x +2) = 0 ⇒ x = -8/3, x = -2
__
factoring using the X method
This method is usually shown using a large graphic X. In the top quadrant is written the product of the leading coefficient and the constant: 3·16 = 48.
In the bottom quadrant is written the coefficient of the x-term: 14.
If one or the other, or both, of these top/bottom values is negative, be sure to keep the sign.
The side quadrants are then filled with values that have a product equal to the top number, and a sum equal to the bottom number. (Pay attention to the signs.) Further, in each of those quadrants, the number written is divided by the leading coefficient, and the fraction reduced to lowest terms.
Here, we would have 6/3 = 2 on one side, and 8/3 on the other side. Now the factors are written as (bx+a), where the reduced fraction on either side is a/b. In our example, the factors are (x+2) and (3x+8)
__
alternate X method
This starts off in the same way the X method does, as described above. However, the factors on either side of the X are not divided by the leading coefficient (a). If those side values are 'p' and 'q', the quadratic is written in factored form as ...
(ax +p)(ax +q)/a = 0
You will notice we used this form above: (3x +6)(3x +8)/3 = 0.
Now, the divisor 'a' can be used to reduce either or both of the numerator factors. Here, the entire factor of 3 can be removed from (3x+6) to make the factorization be ...
(x +2)(3x +8) = 0
__
Sometimes, one factor of the divisor will be removed from one term, and the other factor of it will be removed from the other term. An example of this might be ...
\(\dfrac{(6x+3)(6x+2)}{6}=\dfrac{6x+3}{3}\cdot\dfrac{6x+2}{2}=(2x+1)(3x+1)\)
The length of a bacterial cell is about 5 x 10−6 m, and the length of an amoeba cell is about 3.5 x 10−4 m. How many times smaller is the bacterial cell than the amoeba cell? Write the final answer in scientific notation with the correct number of significant digits.
1.4 x 101
7 x 101
143 x 101
7 x 103
Bacterial cell is smaller than the amoeba cell by 70 times or 7^ 10 times
What is mathematical expression?
A mathematical expression is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.
length of a bacterial cell = 5 x 10^-6 m
length of an amoeba cell = 3.5 x 10^-4 m
= 3.5 x 10^-4 x 100/100 m
= 350 x 10^-6 m
Now, comparing the length
= (350 x 10∧-6) / (5 x 10∧-6 )
= (350/5
= 70 times or 7^ 10 times
Therefore, bacterial cell is smaller than the amoeba cell by 70 times or 7^ 10 times
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2/2-5*9+159/1*3/2-100
Answer:
\( \pink{94.5}\)
Step-by-step explanation:
We have to solve this according to the BODMAS theorem.
That is,
B = brackets
O = of
D = division
M = multiplication
A = addition
S = subtraction
Let us solve now.
\( 2 \div 2 - 5 \times 9 + 159 \div 1 \times 3 \div 2 - 100 \\ 1 - 45 + 159 \times 1.5 - 100 \\ 1 - 45 + 238.5 - 100 \\ - 44 + 238.5 - 100 \\ 194.5 - 100 \\ 94.5\)
5 1/3 yards long and 2 1/6 yards wide. What’s the area
The area of the rectangle has a width of 5 1/3 yards long and 2 1/6 yards wide is 104/9 square yards or 11.56 square yards.
What is the equation to determine the rectangle's area?When calculating a rectangle's area, we multiply the length by the breadth of the rectangle.
What is a mixed fraction?A mixed fraction is one that is expressed by its quotient and remainder.
Area = length * breadth
Given: Length = \(5 \frac{1}{3}\) yards
breadth = \(2 \frac{1}{6}\) yards
First, we need to convert a mixed number into the improper fraction
\(5 \frac{1}{3}\) = \(\frac{(5*3) + 1}{3}\) = \(\frac{16}{3}\)
\(2 \frac{1}{6} = \frac{(2*6) +1}{6} =\frac{13}{6}\)
Therefore the area of the rectangle = Length * width
= \(\frac{16}{3} * \frac{13}{6}\)
=\(\frac{104}{9}\)
=\(\frac{104}{9} yards^{2}\)
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Complete question:
The rectangle has \(5\frac{1}{3}\) yards long and \(2 \frac{1}{6} \\\) yards wide. What’s the area
a high school counselor tells a student that, on average, college graduates earn $10 per hour more than high school graduates. is this statement consistent with the regression evidence? what range of values is consistent with the regression evidence?
The counselor's statement might be consistent with the regression evidence, but we would need more information to verify it and determine the range of values consistent with the regression.
Based on the given information, the high school counselor's statement suggests a correlation between the level of education and hourly earnings. In this context, regression analysis can be used to determine if the statement is consistent with the evidence.
Regression analysis is a statistical method that investigates the relationship between variables, such as education level and hourly earnings, to make predictions or identify trends. If the regression evidence supports the counselor's statement, it will show a positive correlation between college education and increased earnings.To determine the range of values consistent with the regression evidence, we would need the specific regression model and its parameters. This information would allow us to calculate the confidence intervals or predict the increase in earnings based on the given education level. Without this data, we cannot provide a precise range of values.Know more about the correlation
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Can someone help really fast with this question
The answer that describes the polygon RSTU is as follows:
QuadrilateralTrapezoidHow to find a quadrilateral?A quadrilateral is a polygon with 4 sides. Therefore, let's use the properties to find the name of the shape RSTU as follows:
The polygon has 4 sides therefore, it is a quadrilateral.
The quadrilateral has opposite side parallel to each other. The opposite sides are RS and TU.
A trapezoid is a quadrilateral with only one pair of opposite side parallel to each other.
Therefore, the shapes that defines the polygon are as follows:
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Which of the following is the most appropriate unit.to describe the rate at which a person reads
A) Minutes per word, because the independent quantity is in the minutes
B) Minutes per word, because the independent quantity is the words
C) Minutes per word, because the independent quantity is the minutes
D) Words per minute, because the independent quantity is the words
is 12x - 10x^5 - 7 + 3x^4 euivalent to -10x^5 + 3x^4 +12x - 7
Answer:
Yes
Step-by-step explanation:
Step 1: Define
12x - 10x⁵ - 7 + 3x⁴
-10x⁵ + 3x⁴ + 12x - 7
Step 2: Rearrange both equations into standard form
-10x⁵ + 3x⁴ + 12x - 7
-10x⁵ + 3x⁴ + 12x - 7
We see both are equivalent.
Try It #4
For the function f (x) = | 2x − 1 | − 3, find the values of x such that f(x) = 0.
Answer:
x=2 or x= -1
Step-by-step explanation:
when f(x) = 0
⇒| 2x-1 | =3
case(i) (x>1/2)
2x-1=3
x=2
case(ii) (x<1/2)
-(2x-1)=3
2x-1=-3
x=-1
case(iii) (x=1/2)
\(0=3\) absurd.
At the end of of any beginning year a car is worth 5% less than what it was worth at the beginning of the year. If certain car was worth $10,000 at the beginning of 2014, then its value at the end of 2014 was
Answer:
10,000-500=9,500 is what it is worth
Step-by-step explanation:
Pls answer if you only know the correct answer! Thanks! :))
The ratio is (J/W) = 7/6. Or. J= (7/6)• W .
Second line: J= (7/6)• 24. J= 28.
Third line: J= (7/6)• 18. J= 21
yall this one too i need help quick guys plz and ty
Answer:
b. (4,2)
Step-by-step explanation:
step one: isolate x in the first equation
substitute x=6-y: \(\begin{bmatrix}2\left(6-y\right)-2y=4\end{bmatrix}\)
\(\begin{bmatrix}12-4y=4\end{bmatrix}\)
\(-4y=-8\)
\(y=2\)
step two: isolate y in the second equation, substitute y=2
\(x=6-y\)
\(x=6-2\)
\(x=4\)
Answer:
b
Step-by-step explanation:
Given the 2 equations
3x + 3y = 18 → (2)
2x - 2y = 4 → (2)
Multiplying (1) by 2 and (2) by 3 and adding the result will eliminate the y- term
6x + 6y = 36 → (3)
6x - 6y = 12 → (4)
Add (3) and (4) term by term to eliminate y
12x + 0 = 48
12x = 48 ( divide both sides by 12 )
x = 4
Substitute x = 4 into either of the 2 equations and solve for y
Substituting into (1)
3(4) + 3y = 18
12 + 3y = 18 ( subtract 12 from both sides )
3y = 6 ( divide both sides by 3 )
y = 2
solution is (4, 2 ) → b
Im not sure if anyone knows how to do this but if u do could u pleaseee help me with this!!!
Answer:
y = -2x - 5
Step-by-step explanation:
1) Find the slope of the line.
The slope of the original line is the same as the slope of the parallel line.
Slope formula:
\(m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}\)
In this case you can choose any 2 set of points on the table.
\(m = \frac{4 - 2}{-3 - (-2)}\) = \(\frac{4 - 2}{-3 + 2}\) = \(\frac{2}{-1}\) = -2
So the slope of the line is -2
2) Use the point-slope formula to find the equation of the line.
Point-slope formula:
\(y - y_{1} = m(x - x_{1})\)
Now plug in the point (0, -5) and the slope -2 into the equation.
y - (-5) = -2(x - 0)
y + 5 = -2(x - 0)
To solve the equation first apply the distributive property.
y + 5 = -2x + 0
y + 5 = -2x
Next, subtract 5 from sides.
y = -2x - 5
You know have your equation in point-slope form!
The diagonals of kite KITE intersect at point P. If TKE= x+6 and IEK= 2x, find IKE
The length of IKE is 2x - 12.
What is equation?A condition on a variable that is true for just one value of the variable is called an equation.
Since KITE is a kite, we know that KT = IT and KE = IE. Let's call the length of these diagonals d. Then we have:
KT + TI = d
KE + EI = d
Substituting in the given values, we get:
x + 6 + 2x = d
2x + IE = d
Solving for d in the first equation, we get:
3x + 6 = d
Substituting this into the second equation, we get:
2x + IE = 3x + 6
Solving for IE, we get:
IE = x + 6
Therefore, IKE is equal to:
IKE = IT - IE
IKE = (d - KT) - (x + 6)
IKE = (3x + 6 - x - 6) - (x + 6)
IKE = 2x - 12
So, the length of IKE is 2x - 12.
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What is the missing angle?
3x + 27 =180
-27
3x = 153
÷3
x = 51
a=142
(vertically opposite angles are equal)
Reflex angles adds up to 360
360 - (142x2) = 76
76/2 = 38
t & c = 38
Hope this helps!
Answer:
Here you go :) if you need anything tell me!
Can you find the area of the triangle by forming a parallelogram
Yes, we can find the area of the triangle by forming a parallelogram.
The area of a triangle is equal to half the area of a parallelogram.
The conditions are given below.
What is a triangle?It is a two-dimensional figure which has three sides and the sum of the three angles is equal to 180 degrees.
We have,
The area of the triangle can be calculated by forming a parallelogram under the conditions:
1)
If the triangle and the parallelogram are on the same base.
2)
If the triangle and the parallelogram are between the same parallels.
Then,
The area of the triangle is equal to half the area of a parallelogram.
Thus,
The area of the triangle is equal to half the area of a parallelogram.
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An exam grade data for a statistics class has been observed to have a mean of 36.12 and
standard deviation of 3.53. What is the probability that the exam scores are less than 35? O 0.3745 O 0.9987
O 0.1167 O 0.1333
The probability that the exam scores are less than 35 is approximately 0.3745
The probability that the exam scores are less than 35 can be determined using the standard normal distribution.
To calculate this probability, we need to convert the exam scores to z-scores.
The z-score measures the number of standard deviations an observation is from the mean. The formula for calculating the z-score is:
z = (x - μ) / σ
where
x is the value we want to convert to a z-score,
μ is the mean of the distribution,
and σ is the standard deviation of the distribution.
In this case, the mean (μ) is 36.12 and the standard deviation (σ) is 3.53. We want to find the probability that the exam scores are less than 35, so x = 35.
First, let's calculate the z-score:
z = (35 - 36.12) / 3.53
z ≈ -0.3177
Next, we need to find the probability associated with this z-score using a standard normal distribution table or a calculator.
The probability corresponds to the area under the curve to the left of the z-score.
Looking up the z-score in a standard normal distribution table, we find that the probability associated with a z-score of -0.3177 is approximately 0.3745.
Therefore, the probability that the exam scores are less than 35 is approximately 0.3745.
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If DF = 51 and EF = 32, then DE = ?
Answer:
Step-by-step explanation:
51 + 32 = 83 for DE
You have 3 1/4 of frozen strawberries and 4 1/2 cups of frozen blueberries. One smoothie requires 1/2 cup of frozen berries. How many smoothies can you make.
let's convert all mixed fractions to improper fractions, let's add all berries and then see how many times 1/2 go into that sum or namely division.
\(\stackrel{mixed}{3\frac{1}{4}}\implies \cfrac{3\cdot 4+1}{4}\implies \stackrel{improper}{\cfrac{13}{4}} ~\hfill \stackrel{mixed}{4\frac{1}{2}} \implies \cfrac{4\cdot 2+1}{2} \implies \stackrel{improper}{\cfrac{9}{2}} \\\\[-0.35em] ~\dotfill\)
\(\stackrel{ strawberries }{\cfrac{13}{4}}~~ + ~~\stackrel{ blueberries }{\cfrac{9}{2}}\implies \cfrac{(1)13~~ + ~~(2)9}{\underset{\textit{using this LCD}}{4}}\implies \cfrac{13+18}{4}\implies \cfrac{31}{4} \\\\\\ \stackrel{\textit{now let's divide that sum by }\frac{1}{2}}{\cfrac{31}{4}\div \cfrac{1}{2}}\implies \cfrac{31}{4}\cdot \cfrac{2}{1}\implies \cfrac{31}{2}\implies {\Large \begin{array}{llll} 15\frac{1}{2} \end{array}}\)
what is twenty-five hundred-thousandths in decimal form
Answer:
5.620
Step-by-step explanation:
I hope this helps you
Answer:
0.00025
Step-by-step explanation:
Here is a example
please show the work, Thanks.
The gradient of the tangent to the curve 1 y=√√x + √ at the point 4, A) 3/16 B 5/2 C 17/4 D) 0 E 2 is None of the above
Gradient of tangent is 1/4. The correct option is (E) 2.
Given function is y = √√x + √y
Taking derivative of this function with respect to x
dy/dx = (1/2) * (1/2) * x^(-1/2) * (1/2) * y^(-1/2) * dy/dx + (1/2) * y^(-1/2) * dy/dx
Now, at point (4,1),
dy/dx = 1/4
We need to find the value of gradient of tangent at this point.
dy/dx = (1/2) * (1/2) * 4^(-1/2) * (1/2) * 1^(-1/2) * (1/4) + (1/2) * 1^(-1/2) * (1/4)
Simplifying,
dy/dx = (1/8) + (1/8)
dy/dx = 1/4
Gradient of tangent is 1/4.
Hence, the correct option is (E) 2.
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.When developing groups, there will almost always be disagreements and conflicts as members work to develop a common understanding. This stage of group development is called○ forming.○ norming.○ performing.○ storming.○ adjourning.
The stage of group development that is characterized by disagreements and conflicts is called storming. During this stage, group members may have different ideas and opinions about how to approach tasks and goals, and they may struggle to find a common understanding.
Conflict can arise as individuals compete for leadership roles or try to assert their ideas over others. However, this stage is important for groups to progress towards their goals as it allows for open communication and the airing of different perspectives. Eventually, through negotiation and compromise, groups move on to the norming stage where a common understanding is established and roles are defined. From there, groups move on to performing, where they are able to work together effectively towards their goals.
Finally, the adjourning stage is where the group disbands after reaching their goals or completing their tasks.
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Find the measure of x. (Geometry) please help me, i need to get this extra credit done! :(
The graph shows the relationship between the amount of time in
seconds to the distance traveled in feet by a cheetah.
Cheetah's Speed: Time and Distance
POOL
600
(10.500)
500
100
Distance in feet)
3001
(5,290)
2001
174)
100
(1.60)
(0-0)
15
Time (in seconds)
Does the graph represent a proportional relationship? Why or why not?
Justify your answer.
Determine the number of feet the cheetah travels in 7 seconds.
Show your work
Math is Hard help me
Answer:
its c.
rotate 90 ccw then mirror from y-axis
Step-by-step explanation:
The U.S. Senate consists of 100 senators, with 2 from each of the 50 states. There are 50 Democrats in the Senate. A committee of size 10 is formed, by picking a random set of senators such that all sets of size 10 are equally likely. a) Find the expected number of Democrats on the committee. b) Find the expected number of states represented on the committee (by at least one senator) c) Find the expected number of states such that both of the state's senators are on the committee.
Note that based on probabilities,
The expected number of Democrats on the committee is 5.
The expected number of states represented on the committee is 26.
The expected number of states such that both of the state's senators are on the committee is 9.09.
How is this so ?a) The probability that a randomly chosen senator is a Democrat is 50/100 = 1/2.
So, the expected number of Democrats on a committee of size 10 is
1/2 * 10 = 5.
b) The minimum number of states that can be represented on a committee of size 10 is 2, and the maximum numberis 50.
The expected number of states representedon the committee is the average of these two values, which is (2 + 50)/ 2 = 26.
c) There are 50 states, and each state has 2 senators. So, there are a total of 100 pairs of senators.
The probability that a randomly chosen pair of senators both belong to the same state is 50/100 * 49/99
= 1/11.
The expected number of states such that both of the state's senators are on the committee is 100 * 1/11 = 9.09.
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create a real world problem involving a related set of two equations
The real-world problem involving a related set of two equations is given below:
Problem: Cost of attending a concert is made up of base price and variable price per ticket. You are planning to attend a concert with your friends and want to know the number of tickets to purchase for lowest overall cost.
What are the two equations?The related set of two equations are:
Equation 1: The total cost (C) of attending the concert is given by:
The equation C = B + P x N,
where:
B = the base price
P = the price per ticket,
N = the number of tickets purchased.
Equation 2: The maximum budget (M) a person have for attending the concert is:
The equation M = B + P*X
where:
X = the maximum number of tickets a person can afford.
So by using the values of B, P, and M, you can be able to find the optimal value of N that minimizes the cost C while staying within your own budget M. so, you can now determine ticket amount to minimize costs and stay within budget.
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I NEED AN ANSWER ASAP PLEASE
Step-by-step explanation:
the correct answer is option a 6a-7
Write the system first as a vector equation and then as a matrix equation. 5x1 + x2 - 3x3 = 8 2x2 + 4x3 = 0
The system can be written as a vector equation as [5, 1, -3] [x1, x2, x3]^T = [8, 0]^T and as a matrix equation as AX = B, where A = [5 1 -3; 0 2 4], X = [x1; x2; x3], and B = [8; 0].
To write the given system as a vector equation, we group the variables and the constants into vectors and write the equations in a matrix form. Thus, the system can be written as [5x1 + x2 - 3x3; 2x2 + 4x3] = [8; 0], which is a vector equation.
To write the system as a matrix equation, we can write the coefficients of the variables in a matrix A, the variables in a vector X, and the constants in a vector B. Thus, the system can be written as AX = B, where A = [5 1 -3; 0 2 4], X = [x1; x2; x3], and B = [8; 0].
We can then solve for X by finding the inverse of A and multiplying both sides of the equation by it.
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A boat rental charges a flat fee of $45 and $4 per hour. Which expression represents the total cost to rent a boat for h hours
Answer:
45h+ 4
Step-by-step explanation:
you got to divide but the expression is 45h+4
If you want 2 cookies and you only have.50 cents and the cookies cost 10 dollars how much money will you have to get if you only have.50 cents
Answer:
The answer would be 15 cookies.
Step-by-step explanation:
Cookies = 24 cents each
Pop = 45 cents each
you would need about 2000 pennies to have enough to buy two cookies, 2000-50=1950, so if you have 50 cents you would need 1,950 more pennies to be able to get 2 cookies