Answer:
k = 4
Step-by-step explanation:
If x + 2 is a factor of the polynomial;
By the factor theorem, if we set x + 2 = 0, then make x the subject of the formula; if we substitute the value into the polynomial, the result we should have after calculating should be zero
So, we have it that;
x + 2 = 0
x = -2
Substitute into the polynomial and equate to zero
(-2)^3 - k (-2)^2 + 2(-2) + 7k = 0
-8 -4k -4 + 7k = 0
-12 -4k + 7k = 0
-12 + 3k = 0
-3k = -12
k = -12/-3
k = 4
the probability that the same kayla will score above 80% on a mathematics test is 0.70. kayla will take four tests this semester. we want to find the probability she will score above 80% on exactly three out of the four tests. what is the probability of kayla scoring above 80% on exactly three out of the four tests?
The probability of Kayla scoring above 70% on exactly three out of the four tests is 8.64%.
Probability
Given that the probability Kayla will score above 70% on a mathematics test is 0.60, and Kayla will take four tests this semester, and we want to find the probability she will score above 70% on exactly three out of the four tests, to determine what is the probability of Kayla scoring above 70% on exactly three out of the four tests, the following calculation must be performed:
0.6 x 0.6 x 0.6 x 0.4 = X
0.216 x 0.4 = X
0.0864 = X
0.0864 x 100 = 8.64
Therefore, the probability of Kayla scoring above 70% on exactly three out of the four tests is 8.64%.
Learn more about probability in
brainly.com/question/26684125
#SPJ4
Denzel must practice the piano for 210 min each week. he practices for 30 min each day. write a linear equation represent the number of minutes denzel still has to practice after x days?
As per the unitary method, the linear equation represents the number of minutes Denzel still has to practice is N(x) = 210 - 30x
The term unitary method refers a process of finding the value of a single unit, and based on this value.
Here we have given that Denzel must practice the piano for 210 min each week. he practices for 30 min each day
And we need to find linear equation represent the number of minutes Denzel still has to practice after x days
As from the given question we know that Denzel must practice piano for 210 minutes each week.
Therefore, the total practice needed = 210 minutes
And the total minutes practicing per day = 30 minutes
Here let us consider x be the number of days practiced
Then the total minutes practices after n days = 30x
So, the total remaining minutes is calculated as,
=> 210 - 30x
Therefore, the number of minutes Denzel still has to practice after x days is written as, N(x) = 210 - 30x
To know more about Unitary method here.
https://brainly.com/question/28276953
#SPJ4
The difference between a number p and 6 is -14
Equation:
Solution:p=
The value of p in the equation p - 6 = -14 is -8.
What is the value of p in the equation?An equation is the statement that illustrates the variables given. In this case, two or more components are taken into consideration to describe the scenario.
In this situation, the difference between a number p and 6 is -14.
It should be noted that the equation van be illustrated as:
p - 6 = -14
Collect like terms
p = -14 + 6
p = -8
The value of p is -8.
Learn more about equations on:
brainly.com/question/2972832
#SPJ1
What is the nature of roots of 2x² 6x 3 0?
Answer:
The roots are imaginary.
Step-by-step explanation:
⭐ What is "the nature of the roots"
The nature of the roots are how the roots of a quadratic exist.⭐What are the different types of "the nature of the roots"?
The roots could be real numbers, distinct, and rational/irrationalThe roots could be real, equal, and rationalThe roots could be imaginary⭐How do we determine "the nature of the roots"?
Substitute the values of the coefficients (a,b, and c) of a quadratic equation into the quadratic formula( [tex]x =\frac{ -b+/-\sqrt{b^2-4ac} }{2a}[/tex])If the value of the discriminant in the quadratic formula ([tex]b2-4ac[/tex])>0: the roots are real numbers, distinct, and rational/irrationalIf the value of the discriminant in the quadratic formula ([tex]b2-4ac[/tex])=0: the roots are real, equal, and rationalIf the value of the discriminant in the quadratic formula ([tex]b2-4ac[/tex])<0: the roots are imaginaryTo solve this problem, substitute the values of the coefficients of the given quadratic equation into the quadratic formula:
[tex]x =\frac{ -6+/-\sqrt{6^2-4(2)(30)} }{2(2)}[/tex]
Now, compute only the discriminant ([tex]b^2-4ac[/tex]).
[tex]b^2-4ac = 36-4(60)[/tex]
[tex]b^2-4ac = 36-240[/tex]
[tex]b^2-4ac = -204[/tex]
[tex]b^2-4ac[/tex]< 0. Therefore, the roots are imaginary.
Help multiple choice math. Fx
Answer:
Last one
Step-by-step explanation:
There are 11 counter in the bag. 8 of the counter are green. 3 of the counter are blue. Sid take at random two counter from the bag. Work out the probability that Sid take one counter of each colour
The probability that Sid takes one counter of each color is 0.5.
To find the probability that Sid takes one counter of each color, we need to know the total number of possible outcomes when Sid takes two counters from the bag. Since the order in which Sid takes the counters does not matter, there are two cases to consider:
Sid takes a green counter first and a blue counter second. There are 8 green counters and 3 blue counters, so there are a total of 8 * 3 = <<8*3=24>>24 outcomes in this case.
Sid takes a blue counter first and a green counter second. There are 3 blue counters and 8 green counters, so there are a total of 3 * 8 = <<3*8=24>>24 outcomes in this case.
In total, there are 24 + 24 = <<24+24=48>>48 outcomes when Sid takes two counters from the bag.
To find the probability that Sid takes one counter of each color, we divide the number of successful outcomes (24 in each case) by the total number of outcomes (48). This gives us a probability of 24/48 = 1/2 = 0.5.
Learn more about probability, here https://brainly.com/question/30034780
#SPJ4
Carlos plays an arcade game. The scatter plot shows his score and the number of minutes
he plays. A good line of fit is drawn through the points (6, 50) and (12, 80).
What is the slope of the line of fit?
m =?
Answer:
The slope of this line (m) is 5
Step-by-step explanation:
Slope is the change in y over the change in x.
The y values are 80 and 50 (6,50) (12,80) You find the change by subtracting these values
80 -50 = 30
The x values are 12 and 6 (6,50) (12,80) You find he change by subtracting these values.
12 - 6 = 6
[tex]\frac{30}{6}[/tex] this reduces to 5
1.5(x-5)=1 solve for x
Answer: 5.66
Step-by-step explanation:
1.5(x-5)= 1
1.5x - 7.5 = 1
Add 7.5 on both sides
1.5x = 8.5
Divided 1.5 into both sides
x = 5.66
How do you solve a 2x2 matrix 2x2?
To solve a 2x2 matrix equation of the form Ax = b, where A is a 2x2 matrix, x is the variable (a column vector), and b is a known column vector.
You can use the following steps:
Find the inverse of the matrix A. This will allow you to multiply both sides of the equation by A^(-1), which will isolate the variable x on the left side of the equation.To find the inverse of a 2x2 matrix A, use the following formula:A^(-1) = (1/det(A)) * adj(A)
where det(A) is the determinant of matrix A and adj(A) is the adjugate of matrix A. The transposition of a matrix's cofactor matrix is adjugate. The cofactor matrix is a matrix of the determinants of the minors of the original matrix, each of which is multiplied by a cofactor (-1)^(i+j). The minors of a matrix are the determinants of the square submatrices formed by deleting one row and one column from the matrix. The determinant of a matrix is a scalar value that can be computed from its elements.
To learn more about matrix, refer;-
https://brainly.com/question/29132693
#SPJ4
What is the value of TT in math?
Answer:
22/7 or 3.14
the value of pie is 22/7 or if you write it in decimals it will be 3.14.
Which tool is used to make chart 1 look like chart 2 in Excel?
The answer is data labels tool.Data Labels tool is used make chart 1 look like chart 2.When you select the chart and right click and select the option to add data labels.So the required labels will be displayed.
what is excel chart?A chart is a visual display of data in which the data is displayed by symbols such as bars in a bar chart or lines in a chart.It can help people to understand information easily.
How many types of charts?There are following types of charts.
column charts
line charts
bar charts
area charts
pie charts
Now for opening chart tools in excel.you can
click the insert tab and then click the arrow next to chart.click chart type and then double click the chart you want to add.So you can insert chart into excel sheet.
To learn more about chart tools visit the link;
https://brainly.com/question/13571350
#SPJ4
Is 5 A All real number?
Yes, 5 is a all real number.
What is real number?A real number is a number that can take on any value on the real number line, which is an infinite line that extends from negative infinity to positive infinity. Real numbers are used in mathematics to represent quantities such as distance, area, and time. They can also be used to represent irrational numbers, such as pi, and numbers with recurring decimals, such as 1/3.
A real number is any number that is either a rational number (fractions and whole numbers) or an irrational number (numbers that cannot be expressed as a fraction or a whole number). This includes all integers, fractions, and decimals. 5 is an integer, so it is included as a real number.
To know more about real number click
https://brainly.com/question/17201233
#SPJ4
What are the 4 types of discontinuity?
Four types of discontinuity of a function are as follow:
Jump discontinuity , infinite discontinuity, endpoint discontinuity, and Mixed discontinuity.
As given in the question,
Four types of discontinuity are given by :
1. Jump discontinuity :
In this type of discontinuity both side of limit that left hand side and right hand side limit exist but both represents the different value .
2. Infinite discontinuity :
In this case both the side of limit exist but are reaches to infinity.
3. Endpoint discontinuity:
In this case only one side either left or right side of limit exist.
4. Mixed discontinuity:
In this case at least one side of limit either right or left does not exist.
Therefore, the four types of discontinuity are :
Jump discontinuity , infinite discontinuity, endpoint discontinuity, and Mixed discontinuity.
Learn more about discontinuity here
brainly.com/question/28783981
#SPJ4
suppose i work at a call center and i have to track the urgency of the incoming calls. in one day, i had 20 calls. 5 were classified as urgent and 15 were classified as no rush. what is the mode of this data?
The mode of the data at the call center will be 15 which are the non urgent s that was received.
What is the mode of a data set?The mode of a data set is defined as the value of the set of data that appeared or occurred the most. When two values have the same number of occurrences or frequency, it is said that the data set is bimodal or has two modes.
From the scenario given,
The number of calls received in a day = 20 calls.
The number of calls that are urgent = 5
The number of calls that are not urgent = 15
Therefore, the mode of this data set would be the number of non urgent calls which is 15.
Learn more about mode here:
https://brainly.com/question/27951780
#SPJ1
The total of the age of Ann, Bob and Chri i 31 year. What will the total of their age be in three year’ time?
The total of their age be in three years time is 40 years.
As per the given data:
The total of the age of Ann, Bob and Chri is 31 years.
Let the present age of Ann is 'x' years.
Then the age of Ann after 3 years will be x+3
Let the present age of Bob is 'y' years.
Then the age of Bob after 3 years will be y+3
Let the present age of Chri is 'z' years.
Then the age of Chri after 3 years will be z+3.
The total of the age of Ann, Bob and Chri is 31 years.
x + y + z = 31.....(i)
The total of the age of Ann, Bob and Chri after 3 years is ( x + 3 + y + 3 + z + 3 ) years.
= ( x + 3 + y + 3 + z + 3 )
= ( x + y + z + 9 )
From equation (i)..... ( x + y + z = 31 )
= 31 + 9
= 40 years
Therefore the answer is 40 years.
For more questions on ages in word problems
https://brainly.com/question/10775399
#SPJ4
The ratio of soccer balls to basketballs at Andrew’s school is shown on the ratio table. What number completes the ratio table to make an equivalent ratio? [Type your answer as a number.]
soccer balls 30 ?
basket balls 25 5
Answer:
10
Step-by-step explanation:
30-25=5
10-5=5
30:10
25:5
what is the 95% confidence interval for the difference in the two means (construction site minus undisturbed location)?
The 95% confidence interval for the difference in the two means = (-2.56 , 0.16)
What is Confidence Interval?
The mean of your estimate plus and minus the range of that estimate constitutes a confidence interval. Within a specific level of confidence, this is the range of values you anticipate your estimate to fall within if you repeat the test. In statistics, confidence is another word for probability.
Given,
Sample statistics size(n) mean(x) s.d(s)
Construction site 16 x₁ = 5.584 1.812
Undistributed Location 16 x₂ = 6.789 1.945
Standard error = 0.665
Degree of freedom = 30
Critical T-value for 95% confidence interval is 2.0423
The 95% confidence interval for the difference in the two means
(construction site - undistributed location)
= x₁ -x₂ ± (t-value) (standard error)
= 5.584 - 6.786 ± (2.0423) (0.665)
= -1.2020 ± 1.358130
= (-1.2020 - 1.358130 , -1.2020 + 1.358130)
= (-2.56 , 0.156)
= (-2.56 , 0.16)
for complete question see the attachment
To learn more about Confidence Interval visit:
brainly.com/question/24131141
#SPJ4
Given,
Sample statistics size(n) mean(x) s.d(s)
Construction site 16 x₁ = 5.584 1.812
Undistributed Location 16 x₂ = 6.789 1.945
Standard error = 0.665
Degree of freedom = 30
Critical T-value for 95% confidence interval is 2.0423
The 95% confidence interval for the difference in the two means
(construction site - undistributed location)
= x₁ -x₂ ± (t-value) (standard error)
= 5.584 - 6.786 ± (2.0423) (0.665)
= -1.2020 ± 1.358130
= (-1.2020 - 1.358130 , -1.2020 + 1.358130)
= (-2.56 , 0.156)
= (-2.56 , 0.16)
a pet shop pays $40 for a dog bed, and then sells it to a customer for $75. what is the percent markup
Is algebra 8th or 9th grade?
Algebra is advised for ninth grade, and pre-Algebra is taught in eighth grade, according to the Common Core standards that California enacted two years ago and is just now starting to apply.
what is algebra ?In algebra, definite or fixed numbers with values like 2, 9, 0.068, etc. are used. Introduction to algebra, advanced algebra, abstract algebra, linear algebra, and commutative algebra are only a few of the many sub-disciplines of algebra.
here ,
The option to take it in the eighth grade may be given to students who demonstrated extraordinary potential in the subject.
Algebra is often taught in the eighth grade in many schools today, while certain students who meet a certain threshold can finish the subject in the lower grades.
To know more about algebra visit :-
https://brainly.com/question/24875240
#SPJ4
What are the multiples of 42?
The first 10 multiples of 42 are as follows:
42, 84, 126, 168, 210, 252, 294, 336, 378, 420.
What are multiples?In mathematics, multiplying any number by integer results in a multiple.
In other terms, it can be argued that b is a multiple of the supplied two numbers, a, and b if b = na for some integer n, known as the multiplier.
This is comparable to saying that if an is not zero, then b/a is an integer.
When a and b are both integers and b is a multiple of a, then an is said to be a divisor of b.
So, the multiples of 42 are:
42, 84, 126, 168, 210, 252, 294, 336, 378, 420
Therefore, the first 10 multiples of 42 are as follows:
42, 84, 126, 168, 210, 252, 294, 336, 378, 420.
Know more about multiples here:
brainly.com/question/26856218
#SPJ4
Correct question:
What are the first 10 multiples of 42?
In which number does the digit 6 have a value that is 10 times as great as the digit 6 in the number 62,045?
A. 640,488
B. 814,694
C. 28,367
D. 56,808
The number where the digit 6 have a value that is 10 times as great as the digit 6 in the number 62,045 is A. 640,488.
How to illustrate the place value?It should be noted that a place value is the value that is represented based on the position of a number.
In this case, the digit of 6 in 62,045 is 60000. From the options, the digit of 6 in 640488 is 600000. This is 10 times the value.
Therefore, the number where the digit 6 have a value that is 10 times as great as the digit 6 in the number 62,045 is 640,488. The correct option is A.
Learn more about place value on:
brainly.com/question/165424
#SPJ1
the incomes in a certain larger population of college teachers have a normal distribution with mean of $60,000 and standard deviation of $5,000. four teachers are selected at random from this population to serve on a salary review committee. what is the probability that their average salary exceeds $65,000.
If the incomes in a certain larger population of college teachers have a normal distribution with mean of $60,000 and standard deviation of $5,000.the probability that their average salary exceeds $65,000 is 0.0228.
What is probability?Probability is the tendency or likelihood that an event will happen.
First step is to find the standard deviation
Standard deviation= $5,000/√4
Standard deviation= $5,000/2
Standard deviation= $2,500
Second step is to find the z -score
Z= 65,000 - 60,000/2500
Z= 5,000/2500
Z= 2
Now let find the pvalue of 2
pvalue of 2 = 0.0228
Therefore the probability is 0.0228.
Learn more about probability here:https://brainly.com/question/15047130
#SPJ1
Are all squares with equal sides congruent?
Answer:
Squares have to have the same shape and size to be congruent. Therefore, not all squares are congruent, since not all of them are the same size. … This means that they have the same shape, although not necessarily the same size.
hope this helps
mark me brainliest
Step-by-step explanation:
find the indicated critical value z0.11(round to two decimal places as needed.
The indicated critical value of z₀.₁₁ is 0.54.
What does it mean round to two decimal places?
The second place to the right of the decimal point, or the hundredths place, is used to round a decimal value to two decimal places. For instance, you can round 2.83620364 to two decimal places as 2.84 and 0.7035 to two decimal places as 0.70.
A crucial value is the test statistic's value that establishes a confidence interval's upper and lower boundaries or the level of statistical significance for a given test.
The critical value of z₀.₁₁ is z₀.₁ ₊ ₀.₀₁ = 0.5438
The round to two decimal places of 0.5438 is 0.54.
To learn more about critical value, click on below link:
https://brainly.com/question/4386467
#SPJ1
Find the slope between each points.
(-8,18) and (-14,-3)
Answer:
the slope between the two points is 3.5.
Step-by-step explanation:
To find the slope between two points, you can use the formula: slope = (y2 - y1) / (x2 - x1). Plugging in the coordinates for the two points, we get: slope = (-3 - 18) / (-14 - (-8)). Simplifying the expression, we get: slope = -21 / -6Which simplifies to slope = 3.5, So slope between the two points is 3.5.
Answer:
Slope: 7/2
Step-by-step explanation:
Slope formula:
m=(y2-y1)/(x2-x1) ==> where m=slope, (x1, y1), (x2, y2)
(x1, y1), (x2, y2) ==> (x1=-8, y1=18), (x2=-14, y2=-3)
m=(-3-18)/(-14-(-8)) ==> plugin y2=-3, y1=18 and x2=-14, x1=-8
m=(-(3+18))/(-14+8)
m=(-21)/(-6) ==> simplify
m=21/6 ==> m=7/2
what does 12 times a number g mean?
Answer:
The Answer is 12 g because 12* g =12g
Compare kx <5 and kx =5 for any nonzero number k.
(Hint: Pick a value of k and discuss the graph of the inequality versus the graph of the equation.)
The graph of k x = 5 will be a line parallel to Y axis and the graph of k x < 5 will be the region where the value of x does not exceed 5/k.
What is Linear Inequality?Linear Inequalities are the expressions which have a left and a right hand side connected with inequality signs like >, <, ≥ and ≤.
Consider k x = 5
⇒ x = 5/k
This means that, for a nonzero constant k, the value of x will be the same throughout, which is 5/k.
If k = 1, then the value of x will be 5 throughout.
If k = 2, then the value of x will be 5/2 = 2.5 throughout.
and so on.
So the graph of k x = 5 will be a line parallel to the Y axis passing through the point x = 5/k for some constant k.
Now let us consider k x < 5.
⇒ x < 5/k
This means that for any nonzero constant k, the value of x will not be equal or never exceed 5/k.
If k = 1, then the value of x will be less than 5 throughout.
If k = 2, then the value of x will be less than 5/2 = 2.5 throughout.
and so on.
So the graph of k x < 5 includes the region where value of x does not exceed 5/k.
Hence the graph of k x = 5 and k x < 5 is a line parallel to Y axis and the region which does not exceed 5/k respectively.
To learn more about Linear Inequalities, click :
https://brainly.com/question/11897796
#SPJ1
What is the range of f )= 4?
Answer: the range is 4
Step-by-step explanation:
NEED HELP!!!
The graph shows a linear relationship between y, the number of bicycles, and x, the number of tires.
Which statement is true?
Select TWO correct answers.
A. Range: {0, 1, 2, 3, 4, 5}
B. Domain: {0, 1, 2, 3, 4, 5}
C.Range: {0, 2, 4, 6, 8, 10}
D. Domain: 0 ≤ x ≤ 5
E. Domain: {0, 2, 4, 6, 8, 10}
F. Range: 0 ≤ y ≤ 10
The Range={0, 1, 2, 3, 4, 5}
Domain={0, 2, 4, 6, 8, 10}
So, options A and E are correct.
What is meant by range and domain?Its arguments are a group of values that can be plugged into a function's domain. This set includes the x values for a function like f(x). Its range refers to the set of digits that the function considers. The function prints these values in the order they are entered after the insertion of an x value.
Another approach to defining the scope and range of functions is through the use of graphs. Since "domain" refers to the set of possible input values, the full set of input values shown on the x-axis is the domain of a graph. On the y-axis, the range's varied output values are visible.
From the graph the points are (0, 0), (1, 2), (2,4), (3,6), (4,8), (5,10)
So, Range={0, 1, 2, 3, 4, 5}
Domain={0, 2, 4, 6, 8, 10}
Therefore, options A and E are correct.
To know more about domain and range, visit:
https://brainly.com/question/28135761
#SPJ1
Are 6 sided dice fair?
Answer:
Fair dice mean that each of the faces has the same probability of landing facing up. A standard 6-sided die, for example, can be considered “fair” when each of the faces has the same probability of ⅙.
Step-by-step explanation: