[tex]\frac{1}{9}[/tex] fraction of the job is left undone.
What is fraction?Any number of equal parts is expressed by a fraction, which also represents a portion of a whole. A fraction, such as one-half, eight-fifths, or three-quarters, represents how many components of a suitable size there are when stated in ordinary English. fraction, A number that is stated mathematically as a quotient, where the numerator and denominator are divided. Both are integers in a simple fraction. A fraction occurs in the numerator or denominator of a complex fraction. The numerator of a proper fraction is less than the denominator. a week ago.
Given Data
A contractor completed five-ninths of a job before a second contractor completed an additional one-third.
Total work done is 1.
Contractor and second contractor completed:
= [tex]\frac{5}{9}[/tex] + [tex]\frac{1}{3}[/tex]
= [tex]\frac{5+3}{9}[/tex]
= [tex]\frac{8}{9}[/tex]
Total work done = 1
Work left undone:
= 1 - [tex]\frac{8}{9}[/tex]
= [tex]\frac{1}{9}[/tex]
[tex]\frac{1}{9}[/tex] fraction of the job is left undone.
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According to one mathematical model, the average life expenctancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 year for each birth year after 1900. If this trend continues, for which birth year will the average life expentancy be 71 years?
a) Write an equation to model the problem. Let t represent the number of years after 1900 and let n represent men's life expectancy at that time. For example t=12 and n=57.4 in the year 1912.
Answer: ?
b) Solve the equation, then answer the question given above. (Note: You are asked for a year, not a value for t.
Answer: ?
a) An equation to model the problem of determining the birth year when the average life expectancy will be 71 years is y = 55 + 0.2x.
b) From the equation above, from 1980 or in the 80th birth, the average life expectancy will be 71 years.
What is the average life expectancy?The average life expectancy refers to the average time in years that a person is expected to live after birth.
The average life expectancy has been a statistical tool for understanding a person's lifespan on earth based on some demographics.
What is an equation?An equation is a mathematical statement that equates two or more variables, numbers, or values or regards them as equivalent or equal.
For this situation, we can use the formed equation to predict a person's life expectancy average in the future, given the current years and increasing rate of life expectancy.
Life expectancy in 1900 = 55 years
Life expectancy increase for each birth year after 1900 = 0.2
Life expectancy = y
Year = x
y = 55 + 0.2x ... Equation
71 = 55 + 0.2x
0.2x = 16
x = 16/0.2
= 80 birth year
1980 = (1900 + 80)
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Given the example below, the zero product rule is exhibited correctly
because it take the factored form of the quadratic and sets equal to zeros
and solves.
x²+4x-21-
(x+7)(x-3)=0
x+7=0 or x-3=0
x=-7
x=3
True or false
The statement is true. This is an example of Factorization being correct as it takes the factors of the quadratic equation set them equal to 0 and then calculates the value of x.
In the given question, an example of factorization is taken for the equation x²+4x-21 which is factorized using the Middle-Term split rule. We have to find out if the example is conducted correctly.
Factorization is the rule to factorize an equation such that its factors if multiplied together form the equation itself.
We will verify the factorization, for equation x²+4x-21
=> x² + 4x - 21
=> x² + 7x -3x -21
=> x(x + 7) -3(x + 7)
=> (x + 7)(x - 3) = 0
=> x = -7, x = 3
Hence, the statement is True.
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Suppose the top of the minute hand of a clock is 2 in. From the center of the clock. For the duration, determine the distance traveled by the tip of the minute hand (30 minutes)
yes
yes
yes
yes
yes
yes
no
What is the y-intercept of the given graph?
A) -4
B) 3
C) 4
D) None of these choices are correct.
Answer: The Y intercept is B) 3.
Step-by-step explanation:
you just have to see where the line crosses the y axis which in this case is it crosses the y axis on 3
A math test has 12 multiplication problems and 24 division problmes what is the ratio value
The ratio value of multiplication problems to division problems is 1:2.
What is the ratio value?The ratio value compares two quantities or values.
The ratio value shows the quantity of one variable contained in another.
Ratios are depicted by the ratio sign (:) or in fractions, decimals, or percentages.
The number of multiplications problems in the math test = 12
The number of division problems in the math test = 24
The ratio value of their relationship = 12:24 or 1:2
Thus, the math test shows that there are twice as many division problems as multiplication problems.
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provide the correct reason for the statement in line 6. (please help)
Answer:
Step 6: Subtraction Property of =
Step-by-step explanation:
a figure is dilated by a scale factor of 3, if the origin is the center of dilation, what is the new vertex, a', if the old vertex was located. at A(3,4)?
A figure is dilated by a scale factor of 3 if the origin is the center of dilation, What is the new vertex, a', if the old vertex was located. at A(3,4)?
_______________________________________
Please, give me some minutes to take over your question
__________________________________________
Use the graph below which shows the profit y in thousands of dollars of a company in a given year t where t represents the number of years since 1980 find the linear function y where y depends on t the number of years since 1980 Y=_
First we need to find the slope by using two points
(15,190)=(t1,y1)
(25,170)=(t2,y2)
[tex]m=\frac{y_2-y_1}{t_2-t_1}=\frac{170-190}{25-15}=\frac{-20}{10}=-2[/tex]Then we calculate the y-intercept
[tex]190=-2(15)+b[/tex]we isolate the b
[tex]b=190+30=220[/tex]The equation is
[tex]y=-2t+220[/tex]For the function f(x)=x2−9, find
(a) f(x+h),
(b) f(x+h)−f(x), and
(c) f(x+h)−f(x) h
(a) f(x+h)=
The value of f(x+h) is x² + 2xh + h² - 9, the value of f(x+h)−f(x) is 2xh + h², and the value of (f(x+h)−f(x))/h is 2x + h.
What is a function?It is defined as a special type of relationship, and they have a predefined domain and range according to the function every value in the domain is related to exactly one value in the range.
The function:
f(x) = x² - 9
(a) f(x + h)
f(x + h) = (x + h)² - 9
f(x + h) = x² + 2xh + h² - 9
(b) f(x+h)−f(x)
= x² + 2xh + h² - 9 - (x² - 9)
f(x+h)−f(x) = 2xh + h²
(c) (f(x+h)−f(x))/h
= (2xh + h²)/h
= 2x + h
Thus, the value of f(x+h) is x² + 2xh + h² - 9, the value of f(x+h)−f(x) is 2xh + h², and the value of (f(x+h)−f(x))/h is 2x + h.
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Hello? Can someone help me with this please?The coffee preferences of 100 people were recorded in a survey.What proportion of the circle (in degrees) is represented by the espresso segment?
Recall that a whole circle is equal to 360°.
Espresso accounts for 5 out of 100 people surveyed.
Therefore,
[tex]\begin{gathered} 360\degree\times\frac{5}{100} \\ =360\degree\times0.05 \\ =18\degree \end{gathered}[/tex]The proportion of the circle that is represented by the espresso segment is 18°.
Find a formula for the exponential function passing through the points (-1,5/4) and (3,320).
[tex]{\Large \begin{array}{llll} y = ab^x \end{array}} \\\\[-0.35em] ~\dotfill\\\\ \begin{cases} x=-1\\ y=\frac{5}{4} \end{cases}\implies \cfrac{5}{4}=ab^{-1}\implies \cfrac{5}{4}=\cfrac{a}{b} \\\\[-0.35em] ~\dotfill[/tex]
[tex]\begin{cases} x=3\\ y = 320 \end{cases}\implies 320=ab^3\implies 320=ab^{4-1}\implies 320=ab^4 b^{-1} \\\\\\ 320=ab^4\cdot \cfrac{1}{b}\implies \stackrel{\textit{substituting from the previous equation}}{320=\cfrac{a}{b}b^4\implies 320=\cfrac{5}{4}b^4}\implies 320\cdot \cfrac{4}{5}=b^4 \\\\\\ 256=b^4\implies \sqrt[4]{256}=b\implies \boxed{4=b} \\\\\\ \cfrac{5}{4}=\cfrac{a}{b}\implies \cfrac{5}{4}=\cfrac{a}{4}\implies \boxed{5=a}~\hfill {\Large \begin{array}{llll} y =5(4)^x \end{array}}[/tex]
I need help I’m confused and stuck
Answer:
Step-by-step explanation:
x = -A x 2/7 + 10
Answer:
-3.5 (or -3.50); each cup of coffee is $3.50
Step-by-step explanation:
the slope of the function is what is in front of the x
that is
-3.50 or just -3.5
this means that each cup of coffee is $3.50
1 2 3 5 9 Find a number between and 10 Write your answer as an improper fraction and as a mixed number
In finding a number between 9/8 and 10/8, we can use the average of these two.
We can ensure that this number lies between this two.
[tex]Ave=\frac{1}{2}(a+b)[/tex]where a and b are the two numbers
So we have :
[tex]\begin{gathered} Ave=\frac{1}{2}\times(\frac{9}{8}+\frac{10}{8}) \\ =\frac{9}{16}+\frac{10}{16} \\ =\frac{19}{16} \end{gathered}[/tex]Therefore, one number that lies between 9/8 and 10/8 is :
[tex]\begin{gathered} \frac{19}{16} \\ or \\ 1\frac{3}{16} \end{gathered}[/tex]A street that is 270 ft long is covered in snow. City workers are using a snowplow to clear the street. A tire on the snowplow has to turn 27 times in traveling the length of the street. What is the diameter of the tire?
Use the value 3.14 for π. Round your answer to the nearest tenth. Do not round any intermediate steps.
If a street that is 270 ft long is covered in snow. City workers are using a snowplow to clear the street. The diameter of the tire is: 3.2 meters.
Diameter of the tireFirst step is to determine the circumference of the tire
Circumference of the tire = (270 m / 27)
Circumference of the tire = 10 meters
Second step is to make use of 3.14 for π to determine the diameter of the tire using this formula
Diameter of the tire = Circumference of the tire / π
Let plug in the formula
Diameter of the tire = 10 / 3.14
Diameter of the tire = 3.18 meters
Diameter of the tire = 3.2 meters (Approximately)
Therefore 3.2 meters is the diameter.
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An object oscillates as it moves along the
x-axis. Its displacement varies with time
according to the equation
x = 4 sin(pi(t)+ pi/2)
where t = time in seconds and
x = displacement in meters
What is the displacement between t = 0
and t = 1 second?
[?] meters
It is found that the displacement between t= 0 and t = 1 second is of 0.536 m.
The equation of motion is given by:
x(t) = 4 sin(πt + π/2)
The displacement between t= 0 and t = 1 second is given by:
d = x(1) - x(0)
Hence,
position of the object when t = 1
x(1) = 4sin(π(1) + 1 (π/2))
= 4 sin (π + π/2)
= 4 sin (3π/2)
= 4 x √3/2
= 2√3
= 3.464
position of the object when t = 0
x(0) = 4sin(π(0) + (π/2))
= 4 sin (0 + π/2)
= 4 x 1
= 4
Then,
d = x(1) - x(0)
= 4 - 3.464
= 0.536(approx)
Therefore, the displacement of the object between t = 0 and t = 1 is 0.536.
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The ratio of the weight of an object on Planet A to the weight of the same object on Planet B is 100 to 3. If an elephant weighs 2400 pounds on Planet A, find the elephant's weight on Planet B.
The weight of the elephant on planet B given the ratio of the weights on planet A an B is 72 pounds.
What is the weight of the elephant on Planet B?Ratio is used to compare two or more quantities together. It shows the number of times that one quantity is contained in another quantity. In this question, the weight of the elephant on Planet B is 100/3 times that of Planet A.
In order to determine the weight of the elephant on Planet B, multiply the ratio of the weight in planet B by the weight in Planet A and divide by the ratio of weight in planet A.
Weight in Planet B = (3 x 2400) / 100 = 72 pounds
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Lorena solved the equation 5k – 3(2k – ) – 9 = 0. Her steps are below.
5k – 6k + 2 – 9 = 0
–k – 7 = 0
–k = 7
k = 1/7
Analyze Lorena’s work to determine which statements are correct. Check all that apply.
Answer: K= -9
Step-by-step explanation:
5k−3(2k)−9=0
Multiply 3 and 2 to get 6.
5k−6k−9=0
Combine 5k and −6k to get −k.
−k−9=0
Add 9 to both sides. Anything plus zero gives itself.
−k=9
Multiply both sides by −1.
k=−9
(Hope this helps)
Please help I’ll mark you as brainliest if correct !
For the given 14 digit credit card, the value of first letter A is found as 4.
What is defined as the arithmetic progression?An arithmetic progression (AP) is a succession in which the differences between each successive term are the same. In this type of progression, it is possible to derive a formula for the AP's nth term.For the given question;
The formula for finding the sun of nth terms of the AP are-
Sn = n/2(a + l)
Where, Sn is the sum of all termsn is the total number of AP.a is the initial term.l is the last term.From the given 14 digits credit card, consider initial 3 letters.
A,_, 8
The sum of three consecutive numbers is 18.
Thus, applying Sum formula of AP
Sn = n/2(a + l)
n = 3Sn = 18a = Al = 3Put the values;
18 = 3/2(A + 8)
Simplifying;
3A + 24 = 36
A = 12/3
A = 4
Thus, the value of the first digit of the credit card is found as 4.
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what is x3+y3+z3=k explain what the answer is.
Answer:
x=1/3k-y-z
Step-by-step explanation:
3x+3y+3z=k
Move the variables to the right
3x= -3y-3z+k
Divide both sides of the equation by 3
x=1/3k-y+z
HURRY On a coordinate plane, a curve goes through (negative 6, 0), has a maximum at (negative 5, 500), decreases to (negative 2.5, negative 450), increases through (0, negative 50), increases again through (1, 0), and then goes through (2, 400).
The real solutions to the equation 3x5 + 25x4 + 26x3 – 82x2 + 76x = 48 are shown on the graph. What are the nonreal solutions?
StartFraction 1 + i StartRoot 5 EndRoot Over 3 EndFraction, StartFraction 1 minus i StartRoot 5 EndRoot Over 3 EndFraction.
StartFraction negative 1 + i StartRoot 5 EndRoot Over 3 EndFraction, StartFraction negative 1 minus i StartRoot 5 EndRoot Over 3 EndFraction.
StartFraction negative 1 + StartRoot 5 EndRoot Over 3 EndFraction, StartFraction negative 1 minus StartRoot 5 EndRoot Over 3 EndFraction.
StartFraction 1 + StartRoot 5 EndRoot Over 3 EndFraction, StartFraction 1 minus StartRoot 5 EndRoot Over 3 EndFraction.
The non-real solutions of the polynomial expression are x = (1 + 2√-5)/3 and x = (1 - 2√-5)/3
How to determine the non-real solutions?The equation of the polynomial expression is given as:
3x5 + 25x4 + 26x3 – 82x2 + 76x = 48
Rewrite the equation as
3x^5 + 25x^4 + 26x^3 – 82x^2 + 76x - 48 = 0
The points on the graph are given as
(-6, 0), (-5, 500), (-2.5, -450), (0, - 50), (1, 0), (2, 400).
Write out the x-intercepts
(-6, 0) and (1, 0)
This means that
Real solution = -6
Real solution = 1
Rewrite the above as
x = -6 and x = 1
So, we have
x + 6 = 0 and x - 1 = 0
Multiply
(x + 6)(x - 1) = 0
The next step is to divide the polynomial equation 3x^5 + 25x^4 + 26x^3 – 82x^2 + 76x - 48 = 0 by (x + 6)(x - 1) = 0
This is represented as
3x^5 + 25x^4 + 26x^3 – 82x^2 + 76x - 48/(x + 6)(x - 1)
Using a graphing calculator, we have
3x^5 + 25x^4 + 26x^3 – 82x^2 + 76x - 48/(x + 6)(x - 1) = 3x^3 + 10x^2 - 6x + 8
So, we have
3x^3 + 10x^2 - 6x + 8
Factorize
(x + 4)(3x^2 - 2x + 2)
Next, we determine the solution of the quadratic expression 3x^2 - 2x + 2 using a quadratic formula
So, we have
x = (-b ± √(b² - 4ac))/2a
This gives
x = (2 ± √((-2)² - 4 * 3 * 2))/2 * 3
So, we have
x = (2 ± √-20)/6
This gives
x = (2 ± 4√-5)/6
Divide
x = (1 ± 2√-5)/3
Split
x = (1 + 2√-5)/3 and x = (1 - 2√-5)/3
So, the conclusion is that
Using the polynomial expression, the non-real solutions are x = (1 + 2√-5)/3 and x = (1 - 2√-5)/3
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identify the maxima and minima and intervals on which the function is decreasing and increasing
Solution
From the given graph,
The maxima is
[tex](1,-1)[/tex]The minima isThe inetrev
[tex](7,-19)[/tex]aterval inwh which the function is increasing is
[tex](-\infty,1)\cup(7,\infty)[/tex]dec
[tex](1,7)[/tex]20. The mean IQ score for 1500 students is 100, with a standard deviation of 15. Assuming the scores have a normal distribution, answer the following b. How many have an IQ between 70 and 130? 2. How many have an IQ between 85 and 115? e. How many have an IQ over 145?
Given the normal distribution, the following can be illustrated:
1. The number of people who have an IQ between 70 and 130 is 1024.
2. The number of people who have an IQ between 85 and 115 is 1024.
The number of people who have an IQ over 145 is 3.
How to compute the value?1. The The number of people who have an IQ between 70 and 130 will be:
z(115) = (130-100)/15 = 2
z(85) = (70-100)/15 = -2
P(-2< z < 2) = 0.6827
The number of 1500 that have IQ between 70 and 130 will be:
= 0.6827 × 1500
= 1024
2. The number of people who have an IQ between 85 and 115 will be:
z(115) = (115-100)/15 = 1
z(85) = (85-100)/15 = -1
We need to consult Z-table to find P value with this Z value
P(85< x < 115) = P(-1< z < 1) = 0.6827
Number of people of 1500 that have IQ between 85 and 115:
= 0.6827 × 1500
= 1024
3. The number of people who have IQ over 145?
Z(>145)
=( 145-100)/15
=3
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A toy manufacturer is going to produce a new toy car. each one costs $3 dollars to make and the company will also have spent 200$ to set up the machinery to make them. what will it cost to produce the first hundred cars?ar. each one costs $3 dollars to make and the company will also have spent 200$ to set up the machinery to make them. what will it cost to produce the first hundred cars?
Answer:
$500
Step-by-step explanation:
Startup cost: $200
Cost of 1 car: $3
Cost of 100 cars: $3 × 100 = $300
$200 + $300 = $500
12. (01.02)
Which function below is the inverse of f(x) = x² - 9?
FOR EQUATION INVERSES IT MEANS ... x and y swap positions.
[tex]x = (f(x))^{2} - 9 \\ (f(x))^{2} = x + 9 \\ \sqrt{(f(x))^{2} } = \sqrt{x + 9} \\ f(x) = \sqrt{x + 9} [/tex]
ATTACHED IS THE SOLUTION.
Please tell me the answer and how you got the answer (AKA How you solved it) And the first person to give me the correct answer gets marked (Due In 3.5 Minutes)
• Thanks
Step-by-step explanation:
the range is the interval or set of all valid y (functional result) values.
we see that y goes continuously through every value between +5 (we see no y values bigger than that) and -5 (we see no y values lower than that).
the filled dots also tell us that the end points would be included (if this would be a necessary information - it is not, because the curve reaches +5 and -5 also in between).
so, the range is
-5 <= y <= +5
1. How much does it cost to use a yard of ribbon?
#9 satin ribbon
Cost $4.99 per roll
100 yards per roll
Step-by-step explanation:
You will want to divide the cost of $4.99 by 100, this will give you the cost per yard.
Answer:
$4.99 / 100 = $0.0499
About 5 cents per yard.
Please give thanks, 5 stars, and brainliest answer :)
What is the length of segment KL? Round the answer to
the nearest tenth of a units.
K=(-4,-6) L =(5,1)
Answer:
d ≈ 11.40
Step-by-step explanation:
K: (-4, -6); L: (5, 1)
(x₁, y₁) (x₂, y₂)
d = √(x₂ - x₁)² + (y₂ - y₁)²
d = √(5 - (-4))² + (1 - (-6))²
d = √(5 + 4)² + (1 + 6)²
d = √(9)² + (7)²
d = √81 + 49
d = √130 ≈ 11.40
I hope this helps!
5. Each term in the second row is deter- mined by the function y=2x-1. 2 4 5 3 7 9 What number belongs in the shaded box? X y 1 1 3 5 12
Answer:
23
Step-by-step explanation:
12 * 2= 24
24-1= 23
Write the equation of a Circle with the given information.Center: (-14,9) Point on the Circle: (-11, 12)
The equation of a circle with center (a, b) and radius r is
[tex](x-a)^2+(y-b)^2=r^2[/tex]We are given the center as
[tex](a,b)\Rightarrow(-14,9)[/tex]To find the radius, we can use the formula to find the distance between two points, that is, the point on the circle and the center.
[tex]r=\sqrt[]{(y_2-y_1)^2+(x_2-x_1)^2_{}_{}}[/tex]where (x₁, y₁) = (-14, 9)
(x₂, y₂) = (-11, 12)
Thus, we have
[tex]\begin{gathered} r=\sqrt[]{(12-9)^2+(-11-\lbrack-14\rbrack)^2} \\ r=\sqrt[]{3^2+3^2} \\ r=\sqrt[]{9+9} \\ r=\sqrt[]{18} \\ r=3\sqrt[]{2} \end{gathered}[/tex]Therefore, inputting all the values into the equation for a circle, we have
[tex]\begin{gathered} (x-\lbrack-14\rbrack)^2+(y-9)^2=3\sqrt[]{2} \\ \therefore \\ (x+14)^2+(y-9)^2_{^{}}=3\sqrt[]{2} \end{gathered}[/tex]The measure of the vertex angle of an isosceles triangle is three times the measure of a base angle. Find the number of degrees in the measure of the vertex angle.
We will label the base angles of the triangle as "x".
[tex]\text{Base angle=x}[/tex]Since the vertex angle is 3 times the measure of the base angle, the vertex angle will be equal to 3x:
[tex]\text{Vertex angle =3x}[/tex]The following image represent the angles in the isosceles triangle:
Now we use the following property of triangles:
The sum of all of the internal angles in a triangle must be equal to 180°.
Thus, we add the angles and equal them to 180°
[tex]3x+x+x=180[/tex]We combine the terms on the left:
[tex]5x=180[/tex]And divide both sides by 5:
[tex]\begin{gathered} \frac{5x}{5}=\frac{180}{5} \\ x=36 \end{gathered}[/tex]And since x=36, the vertex angle will be:
[tex]\text{vertex angle = 3x = 3(36)=108\degree}[/tex]answer: 108°