Answer:
x = -4 or 2
Step-by-step explanation:
Let the number be x.
Given condition:x² + 2x = 8
Subtract 8 to both sides
x² + 2x - 8 = 0
Using mid-term break method
=> 4 × -2 = 8 (side-term), 4 - 2 = 2 (mid-term)
So, we can break the mid-term into 4 and -2.
x² + 4x - 2x - 8 = 0
Take common
x(x + 4) - 2(x + 4) = 0
Take (x+4) common
(x+4)(x-2) = 0
Either
x + 4 = 0 OR x - 2 = 0 (Zero's method)
x = -4 OR x = 2
[tex]\rule[225]{225}{2}[/tex]
A company determines an employee's starting salary according to the number of years of experience, as detailed in the table. Years of experience salary 0 $40,000 1 $42,150 2 $44,260 3 $46,785 4 $48,820 5 $51,126 use the equation for the line of best fit to predict the salary for an employee with 7 years of experience? (round your answer to the nearest dollar. ) $52,900 $53,340 $53,914 $55,573.
The wage for a worker with 7 years of experience may be calculated using the equation for the line of best fit as follows: D. $55,573.
A line of best fit is what?A trend line, also known as a line of best fit, is a statistical (analytical) technique that is used with a scatter plot to ascertain whether or not there is any link (correlation) between a set of data.
In this case, the pay would be placed on the y-axis of the scatter plot and the employee's years of experience would be put on the x-axis.
What is the equation of best fit?A line of best fit can be described by the equation y=mx+b, where m denotes the slope and b the y-intercept. To comprehend the idea of how to roughly approximate the equation of a line of best fit and make predictions, we will look at two examples that show a scatter plot with a line of best fit.
We may rationally and logically conclude that the equation for the line of best fit is given by: by carefully examining the scatter plot that models the data in the provided table (see attachment).
y = 2233.3x + 39940
The wage for an employee with seven years of experience would thus be predicted using the equation for the line of best fit as follows:
y = 2233.3(7) + 39940
y = 15,633.1 + 39940
y = 55,573.1 ≈ $55,573.
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What is the correct way to do 2x+24+x=150
Answer:
Step-by-step explanation:
for this one you need to solve for x and x=42
Answer:
Step-by-step explanation:
Divide both sides by 2. Divide 24 by 2 to get 12.
There are three methods used to solve systems of equations: graphing, substitution, and elimination.
Use the elimination method to get rid of one of the variables.
Find the value of one variable.
Find the value of the remaining variables using substitution.
Clearly state the final answer.
Check your answer by substituting both values into either of the original equations.
Without graphing or plugging in any values, enter a point that lies on y – 5 = 2(x + 9).
For the given equation, y – 5 = 2(x + 9) the line passes through (5,-9).
What is a linear equation?It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.
If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.
It is given that, the equation of the line is
y – 5 = 2(x + 9)
Compare the equation with the standard equation as
y-y₁=m(x-x₁)
y – 5 = 2(x + 9).
y-5=2(x-(-9)
Where x₁ and y₁ are the points on which the line lies.
Thus, for the given equation, y – 5 = 2(x + 9) the line passes through (5,-9).
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Drag the tiles to the correct boxes to complete the pairs.
The correct boxes to the complete pairs are,
12 - 1/2r → (-8 - r) + (2r - 4)
r - 13/6 → (7r - 3/2) - (2/3 + 6r)
13r + 20 → (6r + 7) + (13 + 7r)
-12 + r → (-8 - r) + (2r - 4)
What is simplified expression?
Writing a similar expression devoid of similar terms is what is meant by the expression "simplify." In other words, we will rewrite the expression using the fewest number of terms.
Consider, the given expressions
(1) (6r + 7) + (13 + 7r)
Simplifying this,
6r + 7 + 13 + 7r
13r + 20
(2) (13 - 3/2r) - (1 - r)
Simplifying this,
13 - 3/2r - 1 + r
12 - 1/2r
(3) (-8 - r) + (2r - 4)
Simplifying this,
-8 - r + 2r - 4
-12 + r
(4) (7r - 3/2) - (2/3 + 6r)
Simplifying this,
7r - 3/2 - 2/3 - 6r
r - 13/6
Hence, the correct boxes to the complete pairs are,
12 - 1/2r → (-8 - r) + (2r - 4)
r - 13/6 → (7r - 3/2) - (2/3 + 6r)
13r + 20 → (6r + 7) + (13 + 7r)
-12 + r → (-8 - r) + (2r - 4)
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Complete question:
Complete question is attached below,
Çok acil arkadaşlar lütfen
Answer:
Step-by-step explanation:
what is the minimum number of cards you would have to pull from a deck to guarantee that you have 4 of a kind? (answer: 40)
The probability that a deck to guarantee that you have 4 of a kind is 40.
Probability:
In math probability refers the possibility of event.
Given,
Here we need to find the minimum number of cards you would have to pull from a deck to guarantee that you have 4 of a kind.
As we know that the total number of cards in the deck is 52.
So, the number of ways of choosing 4 cards from a pack of 52 playing cards is calculated as,
=> ⁵²C₄ = 52!/4!48!
=> ⁵²C₄ = 270725
Similarly, the number of ways of choosing 4 cards of same suit
=> ¹³C₄ = 13!/4!9!
=> ¹³C₄ = 715
So, the number of ways of choosing 4 cards of different suit is calculated as,
=> 715/17 = 40
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A researcher is interested in whether using your finger to follow the words you are reading changes reading speed. He has students complete a reading speed test, first without using their fingers to follow the words and then again while using their fingers to follow the words. The researcher randomly selects a sample of 56 students who, at the beginning of the study, scored an average of 256 words per minute on the reading speed test. In the trial where they used their fingers while they read, the students scored an average of 6 words per minute higher. The standard deviation of the difference scores was 29. Since the sample size is larger than 30, the researcher can assume that the sampling distribution of MD is normal. He uses a repeated-measures t test to test that the mean difference is zero, and he describes the results as follows: In the trial where they used their fingers while they read, the reading speed among students is not significantly different than when they do not use their fingers while they read, t(55) = 1.55, p = 0.127. If the researcher had used a repeated-measures ANOVA to test that the mean reading speed is the same before and after using their fingers while they read, he would describe the results as follows (fill in all missing values): In the trial where they used their fingers while they read, the reading speed among students is different than when they do not use their fingers while they read, F()=, p = 0.127.
The confidence interval for the given ANOVA test to calculate the average typing speed be, (144.83 , 155.17) and the margin of error of the poll be, ±5.17
On Subtracting 1 from your sample size, we get
150 – 1 = 149.
On Subtracting confidence level from 1, and then divide by two.
(1 – .95) / 2 = 0.025
Now, df = 149 and α = 0.025
from the table at df = 149 we got 2.262.
Divide your sample standard deviation by the square root of your sample size.
28 / √(150) = 2.28
Now, 2.262 × 2.28 = 5.17
So, the confidence interval be,
(150 - 5.17 , 150 + 5.17) = (144.83 , 155.17)
Hence, the confidence interval for the given ANOVA test to calculate the average typing speed be, (144.83 , 155.17) and the margin of error of the poll be, ±5.17
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a business major needs 3 humanities courses to graduate. they can be selected from 29 courses offered. how many ways can the 3 courses be selected?
The number of ways 3 courses can be selected is 3654.
How to calculate combination?
The sequence of the results is irrelevant when calculating the overall outcomes of an event using combinations. We will use the formula nCr = n! / r! * (n - r)! to calculate combinations, where n denotes the total number of items and r denotes the number of things being chosen at a time.The sum of all positive integers that are greater than zero and less than your number is known as a factorial. An exclamation point is written after the number to represent a factorial.Total no. of courses available = 29
Courses needed to graduate = 3
No of ways these courses can be selected:
= ²⁹C₃
= 29!/ [(29-3)! - 3!]
= 29! / 26! 3!
= 29 * 28 * 27 * 26!/ 26! 3*2
= 29* 14* 9
=3654
So, the number of ways 3 courses can be selected is 3654.
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An arithmetic sequence has a 2nd term of -2 and a 7th term of 18.
1. What is the 10th term in the sequence? 2. Write an explicit formula for the sequence.
3. Write a recursive formula for the sequence.
4. What is the sum of the first 10 terms?
Answer:
Step-by-step explanation:
The mathematical way to describe an interaction is: O A difference in differences A A caveat O A qualified main effect O A patterned pattern
The mathematical way to describe an interaction is: A difference in differences.
What is an interaction?In statistics, an interaction may appear when analyzing the relationship between three or more variables, and defines a situation in which the effect of one causal variable on an outcome forms on the state of a second causal variable.
Interactions are often considered in the context of regression analyses or factorial experiments. An interaction happens when an independent variable has a different effect on the outcome depending on the values of another independent variable.
To find an interaction, we need a factorial design, in which the two (or more) independent variables are crossed with one another, so there are reflections at every combination of levels of the two independent variables.
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Parvinder wants to save $500 for a trip. Which inequality shows the least amount she must save each month for 6 months to accomplish this?
Answer: $84 i think
Step-by-step explanation:
Factor each polynomial
Answer:
(x + 7)(x² - 8)
Step-by-step explanation:
x³ + 7x² - 8x - 56 =
let's put the total multiplier x² out of brackets
x²(x + 7) - 8x - 56 =
let's put the total multiplier -8 out of brackets
x²(x + 7) - 8(x + 7) =
let's put the total multiplier (x + 7) out of brackets
(x + 7)(x² - 8)
Write an equation for the nth term of the arithmetic seqeuence. Then find a10. 12,1,112,2,.
An equation for the nth term of the arithmetic sequence: an = n - 6.
ad 10th term a10 = 4.
Define the term arithmetic sequence?A sequence of a form a, a + d, a + 2d, a + 3d, a + 4d, etc. is an arithmetic sequence.A common difference of the sequence is d, and the number an is the first term.The formula for the nth term of the
an = a + (n -1)d
In which,
a = initial termd = common differencen = total number of termsThe arithmetic sequence is given as-
−5,−4,−3,−2, ...
Then, the equation will be
d = a2 - a1
d = -4 - (-5) = 1
an = a + (n -1)d
an = -5 + n - 1
Put n = 10 in the equation.
a10 = 10 - 6
a10 = 4
Thus, the 10th term of the sequence is 4.
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The correct question is-
Write an equation for the nth term of the arithmetic sequence. Then find a10.
−5,−4,−3,−2, ...
a hand of 13 cards is dealt at random from a bridge deck of 52 cards. find the probability that the hand contains 4 queens. (round your answer to four decimal places.)
The probability of the hand containing 4 queens when picked at random is 0.0026.
We can solve the given question easily using probability, permutations, and combinations.
We can pick any card other than the queen in the following number of ways = ⁴⁸C₉ (i)
The queen card can be picked in the following number of ways
= ⁴C₄= 1 (ii)
The total number of ways to choose 13 cards is = ⁵²C₁₃ (iii)
Using the values of (i), (ii), and (iii), we get -
Probability = (⁴⁸C₉ * 1) / ⁵²C₁₃
= [tex]\frac{48!/9!(48-9)! *1 }{52!/13!(52-13)! }[/tex]
= 1677106640 * 1 / 635013559600
= 0.00264
If this is rounded to four decimal places, we get = 0.0026.
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what
Expand 2 ( c − 2 )
Answer:
[tex]\boxed{\tt 2c-4}[/tex]
Step-by-step explanation:
[tex]\tt 2\left(c-2\right)[/tex]
Apply the distributive property:-
[tex]\tt 2\left(c-2\right)=2c-2\times \:2[/tex]
[tex]\bf 2\times\:2=4[/tex]
[tex]\tt 2c-4[/tex]
___________________
Hope this helps!
Have a great day!
The hypotenuse of a right triangle measures 15 cm and one of its legs measures 1 cm. Find the measure of the other leg. If necessary, round to the nearest tenth.
The value of the other leg of the right angled triangle is found as 4√14 cm.
Explain the term Pythagorean theorem?In a right-angled triangle, every square of a hypotenuse side is equal to total sum of the squares of the remaining two sides, according to Pythagoras's Theorem. These triangle's three sides are known as the Perpendicular, Base, and Hypotenuse.For the given question, the values for the right angled triangle are-
Hypotenuse (H) - 15 cm
Side (B) = 1 cm
Let the other side be (P).
Then,
H² = P² + B²
P² = H² - B²
Put the values-
P² = 15² - 1²
P² = 225 - 1
P² = 224
P = 4√14
Thus, the value of the other leg of the right angled triangle is found as 4√14 cm.
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In triangle def, m∠d = (2x 19)°, m∠e = (3x 24)°, and m∠f = 87°. determine the degree measure of the exterior angle to ∠d. 54° 39° 141° 126°
Each corner of a triangle can form an exterior angle of the triangle by extending one side of the triangle. As we can see in above picture, where 'w' is exterior angle of angle 'z'.
The measure of the exterior angle to ∠d is 126°. So, the correct option is option (D).
We have given that,
A ∆DEF such that m∠d = (2x + 19)°,
m∠e = (3x + 24)°, and m∠f = 87°.
we have to find out the degree measure of the exterior angle to ∠d.
As we know that sum of angles of triangle is equal to 180° .
so, m∠d + m∠e + m∠f = 180°
=> (3x + 24)° + (2x + 19)° + 87° = 180°
=> (5x + 24 + 19 + 87)° = 180°
=> 5x + 130° = 180°
=> 5x = 50°
=> x = 10°
plug this value in angle d , angle e we get ,
m∠d = (3 ×10 + 24 )° = 54°
We can see that adding the angle measurement d and the exterior angle measurement gives d = 180 degrees. This is because they are a pair of adjacent angles and both lie on a straight line.
measure of Exterior angle of ∠d + measure of ∠d = 180°
Measure of exterior angle of ∠d
= 180° - m∠d
= 180° - 54° = 126°
Hence, the measure of exterior angle of d is 126°.
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PLEASE HURRY! I WILL GIVE BRAINLIEST TO THE PERSON WHO GIVES THE RIGHT ANSWER! DO NOT SPAM OR I WILL REPORT!
2300 dollars is placed in an account with an annual interest rate of 5.5%. To the nearest tenth of a year, how long will it take for the account value to reach 4300 dollars?
Answer:
I think 6.2 years
Step-by-step explanation:
I THINK OK
by what number do we multiply the initial enrollment to get the enrollment one decade later given a 30 % increase
The final enrollment after one decade is obtained by taking the 30% of the initial enrollment.
Describe the term percentage of the number?A value or ratio that might be stated as a fraction over 100 is thought to as a percentage in mathematics. If we need to calculate a percentage of a number, we should divide it by its total and then multiply it by 100. The proportion ultimately refers to a component per hundred. Per 100 is what the word percent means. The letter "%" stands for it.For the stated question-
Let initial enrollment = 100.
After one decade, the enrollment added 30% of the initial.
Thus,
= 100 + 30% of 100
= 100 + 130
= 130
Thus, the final enrollment after one decade is obtained by taking the 30% of the initial enrollment.
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a right triangle's height is 5 times the length of its base. if the area of the triangle is 160, what is its height?
If a right triangle's height is 5 times the length of its base and the area of the triangle is 160, then the height of the triangle is 40 units
A right triangle's height is 5 times the length of its base
Consider the length of the base as b and the height as h
h = 5b
The area of the triangle = 160 square units
The area of the triangle = 1/2 × b × h
Where b is the base of the triangle
h is the height of the triangle
Substitute the values in the equation
1/2 × b × h = 160
1/2 × b × 5b = 160
1/2 ×5b^2 = 160
5b^2 = 320
b^2 = 320/5
b^2 = 64
b = [tex]\sqrt{64}[/tex]
b = 8 units
Then the height of the triangle h = 5b
= 5 × 8
= 40 units
Therefore, the height of the triangle is 40 units
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The diameter, d, of the circle below is 77 cm.
What is the circumference of the circle?
Give your answer to 1 d.p.
77 cm
circumference = nd
Answer:
C ≈ 241.9 cm
Step-by-step explanation:
the circumference (C) of the circle is calculated as
C = πd ( d is the diameter )
here d = 77 , then
C = π × 77 ≈ 241.9 cm ( to 1 dec. point )
consider the following binomial experiment: a survey shows 53% of households in centercity own a dvd player. in a random sample of 22 households in this city, what is the probability that exactly 17 households own a dvd player? a) 0.0121 b) 0.0124 c) 0.0120 d) 0.0123 e) 0.0126 f) none of the above.
The probability that exactly 17 households own a DVD player is b) 0.0124
How to calculate the probability?P = probability of own DVD player = 53% = 0.53
n = sample of households = 22
x = number of households own a DVD player = 17
Since it is binomial experiment, we use binomial probability formula to calculate the probability.
P(X) = [tex]^{n}C_{x}\times P^{x}\times (1-P)^{n-x}[/tex]
With combination formula as below,
[tex]^nC_x[/tex] = [tex]\frac{n!}{x!(n-x)!}[/tex]
P(X) = [tex]^{22}C_{17}\times 0.53^{17}\times (1-0.53)^{22-17}[/tex]
= [tex]\frac{22!}{17!(22-17)!}\times 0.53^{17}\times 0.47^{5}[/tex]
= 26334 × 0.0000205 × 0.0229345
= 0.0123811
= 0.0124
Thus, the probability is 0.0124 for 17 households own DVD player.
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Calculate the social security and Medicare deductions for the following employee assume a tax rate of 6.2% on $128,400 for social security and 1.45% for Medicare. Logan has a cumulative earnings before this pay period was $128,300 , and pay amount this period was$3,000. What is the social security and what was the medicare
The social security and Medicare deductions for the following employee are $7768 and $1816 respectively.
What is arithmetic?
Arithmetic is an elementary a part of arithmetic that consists of the study of the properties of the normal operations on numbers—addition, subtraction, multiplication, division, mathematical process, and extraction of roots
Main body:
Cumulative Earnings before this pay period = $128,300
pay amount this period = $3000
tax rate of 6.2% on social security = 6.2%
effective earning = 128300 = 3000
= 125300
social security deduction = 6.2 % of 125300
⇒ 6.2 *125300 /100
⇒$7768
Medicare deductions = 1.45%
⇒ 1.45*125300/100
⇒$1816
Hence , the social security and Medicare deductions for the following employee are $7768 and $1816 respectively.
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A CBS News/New York Times poll found that 329 out of 763 randomly selected adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 88% accuracy. Round your answers to at least three decimal places.
The true proportion of adults is in the interval 0.4026< P< 0.4594.
Here we have to estimate the true population of adults who would like to travel to outer space with 88% accuracy.
Data provided:
selected (x) = 329
Total(n) = 763
Sample proportion (p') = x/n
= 329/ 763
= 0.431
Critical z-value = 1.59
margin of error(E) = z[tex]\sqrt{p'( 1-p')/n}[/tex]
= 1.59 [tex]\sqrt{0.431(1-0.431) / 763}[/tex]
= 1.59 × 0.0179
= 0.0284
88% confidence interval is:
(p' ± E) = ( 0.431 ± 0.0284)
= 0.4594 and 0.4026
Therefore the estimate is 0.4026< P< 0.4594.
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in order to calculate the correlation between two variables related to the same sample what do you need to calculate first?
In order to calculate the correlation between two variables related to the same sample you need to calculate first the mean of each variable.
Before determining the correlation, the covariance of the two variables in the issue must always be computed. The standard deviation of each variable is then needed. The correlation analysis is calculated by dividing the covariance even by combination of a standard deviations of two or more variables.
A correlation is a statistical measurement of the two-variable connection. The measure works best with parameters that have a linear connection with one another.
The degree of the relationship between two variables is examined using correlation. To get the correlation between two variables, divided the covariance value by the standard deviation of both variables. Correlation analysis for two variables in the same sample should be performed. If you run a survey with two factors, a responder should be able to answer both variables at a glance. Furthermore, other participants' replies to the parameter might be evaluated for a correlation test.
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PLS ACTUALLY ANSWER BOTH REASONS !!!!! 100 PTS CHOICES ARE THE SAME FOR BOTH
The blanks in this two-column proof should be completed (filled) as follows:
Statements Reasons_______________
ΔADB ≅ ΔCDB HL.
AD ≅ CD CPCTC.
What is the Right Triangles Similarity Theorem?In Mathematics, the Right Triangles Similarity Theorem states that when the altitude of a triangle is drawn to the hypotenuse of a right angled triangle, then, the two (2) triangles that are formed would be similar to each other, as well as the original triangle.
What is CPCTC?In Mathematics, CPCTC is an acronym for corresponding parts of congruent triangles are congruent and it states that the corresponding angles and side lengths of two (2) or more triangles are congruent if they are both congruent i.e AD ≅ CD.
Additionally, HL is an acronym for hypotenuse leg and it states that if the hypotenuse and one (1) leg in a right-angled triangle are congruent to the hypotenuse and leg of another right-angled triangle, then the two (2) triangles would be congruent i.e ΔADB ≅ ΔCDB.
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Answer:
ΔADB ≅ ΔCDB HL.
AD ≅ CD CPCTC.
Step-by-step explanation:
or what the guy said on top :D
please help me i need it bad
Using the secant-secant theorem,
[tex]\frac{13x+7-60}{2}=5x-10 \\ \\ 13x-53=10x-20 \\ \\ 3x-53=-20 \\ \\ 3x=33 \\ \\ \boxed{x=11} \\ \\ \\ \\ \angle RDB=5(11)-10=\boxed{45^{\circ}}[/tex]
help w this, dont guess
10c - cd + d^3 (if c = -6 and d= 2)
The required simplified solution of the given expression is -40.
Given that,
To determine the simplified solution of the given expression 10c - cd + d³ at c = -6 and d = 2.
The process in mathematics to operate and interpret the function to make the function or expression simple or more understandable is called simplifying and the process is called simplification.
Here,
= 10c - cd + d³
Substitute the values,
= -60 + 12 + 8
= -40
Thus, the required simplified solution of the given expression is -40.
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I am a number with 3 tens and 23 ones. What number am I
Answer:
Is it 53?
Step-by-step explanation:
3 tens means 30, and adding 23 ones would be 53