All real numbers r for which there exists exactly one real number a such that when (x+a)(x² +rx+1) is expanded to yield a cubic polynomial, all of its coefficients are greater than or equal to zero are given as r = -1
A real number is a quantity of a continuous number that can express a distance along a line in mathematics.
Hence the workings for the above result are indicated as follows:
Expanding the brackets, we see that we want the following three inequalities to be true.
a ≥ 0 (constant term) (1)
ar + 1 ≥ 0 (coefficient of x) (2)
a + r ≥ 0 (coefficient of x²) (3)
If r ≥ 0, then any a ≥ 0 meets the requirement of (1), (2), and (3).
It remains to address r < 0. In this case, note that (3) immediately suggests (1)
Hence, we only need to look at (2) and (3). Given that r < 0, inequalities (2) and (3) are equivalent to the following.
a ≤ − 1/r (4)
a ≥ − r (5)
Therefore, we seek all values of r < 0 such that there is exactly one real number satisfying the expression −r ≤ a ≤ −1/r (6)
Thus −r = −1/r ,
This implies r = ±1.
Given that r < 0 we have r = −1.
This implies that the only corresponding value of a is a = 1.
It only remains to follow that (x + 1)(x² − x + 1) = x³ + 1, which has no negative coefficients.
Learn more about real numbers:
https://brainly.com/question/155227
#SPJ1
Full Question:
Find all real numbers r for which there exists exactly one real number a such that when (x+a)(x² +rx+1) is expanded to yield a cubic polynomial, all of its coefficients are greater than or equal to zero.
Watch help video
Aisha went shopping for a new pair of sneakers. The listed price of the pair of
sneakers was $43, but the price with tax came to $44.29. Find the percent sales tax.
The percent sales tax of the purchase is 3 %.
How to find percent sales tax?A sales tax is a consumption tax imposed by the government on the sale of goods and services.
She went shopping for a new pair of sneakers.
The listed price of the pair of sneakers was $43, but the price with tax came to $44.29.
Therefore, the percent sales tax can be found as follows:
sales tax = 44.29 - 43
sales tax = $1.29
Therefore,
percent sale tax = sale tax / cost with tax × 100
percent sale tax = 1.29 / 43 × 100
percent sale tax = 129 / 43
Therefore,
percent sale tax = 3%
learn more on sales tax here: https://brainly.com/question/22445105
#SPJ1
Terry bought 2 shirts for $14 each, 2 pair of socks for $2.99 a pair, and a pair of slacksfor $25.00. The sales tax rate is 6.5%. How much did he pay? (Enter the dollar amountonly. Round to the nearest cent.)
Answer:
Explanation:
Terry bought 2 shirts for $14 each.
That is $28 on shirts
2 pair of socks for $2.99
That is $5.98 on socks
A pair of slacks for $25
The sales tax rate is 6.5% or 6.5/100 or 0.065
We want to know how much he paid.
Adding all the items he bought together, we have:
$28 + $5.98 + $25
= $58.98
Next, we apply the sales tax rate.
Take 6.5% of $58.98
This is: $58.98 * 0.065
= $3.83
Finally, add the sales tax with the amount we got
$58.98 + $3.83
= $62.81
He paid $62.81 in total
I need help with this for my class
pls help asap Noor’s family is meeting her grandparents at a restaurant. The restaurant is 24.5 miles from Noor’s house. This is 65.5% of the distance from Noor’s house to her grandparents’ house. What is the distance between the two houses? Round your answer to the nearest tenth of a mile.
The distance between Noor's house and her grandparent's house is 37.40 miles or if rounded off to the nearest tenth, it will be 40 miles using the estimation concept.
As per the question statement, Noor’s family is meeting her grandparents at a restaurant and the restaurant is 24.5 miles from Noor’s house but this is 65.5% of the distance from Noor’s house to her grandparents’ house.
We are supposed to find the distance between Noor's house and her grandparent's house. We will use the concept of estimation.
Distance between Noor's house and restaurant = 24.5 miles
Let distance between Noor's house and her grandparent's house be "x" miles.
So the distance between grandparent's house and restaurant = x - 24.5
Now it is given that 24.5 miles is 65.5% of the distance from Noor’s house to her grandparents’ house.
So, 65.5% of x = 24.5
(65.5*x)/100 = 24.5
65.5*x = 2450
x = 2450 / 65.5
x = 37.40 miles
If rounded off to the nearest tenth mile, we get
x = 40 miles.
So, the distance between Noor's house and her grandparent's house is 37.40 miles or if rounded off to the nearest tenth, it will be 40 miles.
Estimation: Having an approximate estimate of something's worth, number, size, or extent is referred to as estimation in mathematics.To learn more about this Estimation click on the link given below:
https://brainly.com/question/28338974
#SPJ1
Eleanor and Max used two rectangular pieces of plywood, placed end-to-end, to make a long rectangular stage for the school play. One board was 6 feet long, and the other was 5
1
2
feet long. The two pieces of plywood had equal widths. The total area of the stage was 66
1
8
square feet. What was the width of the plywood?
The width of the plywood = 23/8 ft
The two rectangular pieces of plywood had equal widths.
The length of first rectangular piece = 6 ft
The length of second rectangular piece = 5 1/2 ft = 11/2 ft
The two pieces are joined to make a single rectangular stage.
Then the total length of the stage = 6 + 11/2 = 23/2 ft
Now area of the rectangular stage = 66 1/8 = 529/8 square feet.
⇒ length x width = 529/8
⇒ 23/2 x width = 529/8
⇒ width = 529/8 x 2/23 = 23/4 ft
Let 'x' be the width of a rectangular plywood.
Then 2x = width of the stage
⇒ 2x = 23/4
⇒ x = 23/8 ft
Hence width of the plywood = 23/8 ft
Learn more about area of rectangle at https://brainly.com/question/2607596
#SPJ1
PLEASE PLEASE HELP!!!
In the figure shown at right, the area of the large rectangle is (5x)(8x+1) and the area of the small rectangle is (4x)(2x) which of the following expression represents the area of the shaded region?
Given:
Area of large rectangle = (8x + 1)(5x)
Area of small rectangle = (4x)(2x)
To find area of the shaded region, subtract the area of the small rectangle from the large rectangle.
We have:
Area of large rectangle =
[tex]\begin{gathered} (8x+1)(5x) \\ \\ =8x(5x)+1(5x) \\ \\ =40x^2+5x \end{gathered}[/tex]Area of small rectangle =
[tex]\begin{gathered} (4x)(2x) \\ \\ =8x^2 \end{gathered}[/tex]Area of shaded region =
[tex]\begin{gathered} (40x^2+5x)-(8x^2) \\ \\ 40x^2+5x-8x^2 \\ \\ \text{Combine like terms:} \\ 40x^2-8x^2+5x \\ \\ =32x^2+5x \end{gathered}[/tex]Therefore, the area of the shaded region is = 32x² + 5x
ANSWER:
[tex]32x^{2}+5x[/tex]A fair number cube with the numbers 1, 2, 3, 4, 5, and 6 is rolled
a. What is the probability of getting an even number?
b. What is the probability of getting a factor of 6?
The probability of getting an even number is 1/2 while the probability of getting a factor of 6 is 1/6
How to determine the probabilities?The probability of an even number
From the question, the sample space of the number cube is given as
Space = 1, 2, 3, 4, 5, and 6
The above means that
Sample size, n = 6 ---- i.e. the number of observations
Number of even numbers, x = 3
The probability of getting an even number is then calculated as
P(Even) = Number of even numbers/Sample size
This gives
P(Even) = 3/6 = 1/2
The probability of a factor of 6
From the question, the sample space of the number cube is given as
Space = 1, 2, 3, 4, 5, and 6
The above means that
Sample size, n = 6 ---- i.e. the number of observations
Number of factor of 6, x = 1
The probability of getting a factor of 6 is then calculated as
P(factor) = Number of factor of 6/Sample size
This gives
P(factor) = 1/6
Hence, the probability is 1/2 and 1/6
Read more about probability at
https://brainly.com/question/14888629
#SPJ1
prove that: [tex](a+b)^-^1.(a^-^1 +b^-^1) = (ab)^-^1[/tex]
Answer:
See below
Step-by-step explanation:
[tex]\frac{1}{a+b}[/tex] ([tex]\frac{1}{a}[/tex] + [tex]\frac{1}{b}[/tex])
[tex]\frac{1}{a+b}[/tex] ([tex]\frac{b}{ab}[/tex] + [tex]\frac{a}{ab}[/tex])
[tex]\frac{1}{a+b}[/tex] ([tex]\frac{b+a}{ab}[/tex])
[tex]\frac{(a+b)}{(a+b)(ab)}[/tex]
[tex]\frac{1}{ab}[/tex]
[tex]ab^{-1}[/tex]
What is the slope of the line that passes through the points (3, -3)(3,−3) and (18, -3)(18,−3)? Write your answer in simplest form.
Answer:
0 (its a straight line horizontal)
Step-by-step explanation:
-3+3=0
18-3=15
0/15 = 0
slope=0
Mia made at least one mistake when
simplifying the expression below. The steps she took are shown.
Step 1:
Step 2:
Step 3:
In which step did Mia make her first mistake?
Choose one option from each drop-down menu to answer the questions
Mia made a mistake in Choose. She simplified the Choose
Choose
incorrectly She should have
Using properties of exponents, it is found that Mia's first mistake is described as follows:
Mia made a mistake in Step 3. She simplified the exponents 16 and -8 incorrectly. She should have subtracted them.
Which properties of exponents are used in this problem?When two terms with the same base and different exponents are multiplied, we keep the base and add the exponents, as follows:
3^0 x 3^(16) = 3^(0 + 16) = 3^16.
Hence the Step 1 is correct.
For the power of power rule, we keep the base and multiply the exponents, hence:
(3^(-4))² = 3^(-4 x 2) = 3^(-8).
Hence the Step 2 is correct.
When two terms with the same base and different exponents are divided, we keep the base and subtract the exponents, as follows:
3^16/(3^(-8)) = 3^(16 - (-8)) = 3^(16 + 8) = 24.
Which is Mia's mistake, as she did not subtract the exponents.
What is the missing information?The steps are missing and are given by the image at the end of the answer.
More can be learned about properties of exponents at https://brainly.com/question/11945635
#SPJ1
the figure is a rectangular pyramid the base is rectangle abcd and the four faces abe bce cde and ade b=meet at the vertex e the edges are ab bc cd ad ae be ce and de the vertices are abce and e
Answer:
here you go I guess
Step-by-step explanation:
3x-(2x+10) for x= 7 5/13
The result of the expression 3x-(2x+10) for x = [tex]7\frac{5}{13}[/tex] is -2.61
The expression is
3x-(2x+10)
The expression is the mathematical sentence with a minimum of two variables and at least one math operation.
The value of the x = [tex]7\frac{5}{13}[/tex]
Convert the mixed fraction to the simple fraction
[tex]7\frac{5}{13}[/tex] = 96/13
Convert the simple fraction to the decimal form
96/13 = 7.39
Substitute the value of x in the given expression 3x - (2x + 10)
= 3 × 7.39 - (2×7.39 + 10)
Multiply the terms first
= 22.17 - (14.78 + 10)
= 22.17 - (24.78)
= -2.61
Hence, the result of the expression 3x-(2x+10) for x = [tex]7\frac{5}{13}[/tex] is -2.61
Learn more about expression here
brainly.com/question/1519167
#SPJ1
Which of the following statements is the best description of a survey?
A survey is a list of questions used to acquire customer feedback.
A survey is a study that collects data on every subject in sample.
A survey always collects categorical data.
A survey is a kind of convenience sample.
Answer:
I believe it's " a study that collects data on every subject in sample"
Simplify the expressions:
a. (7x²+ 2) + (2x² +3) =
b. (5x + 2) + (8x +3) =
c. (5x)(8x +3) =
Answer:
a. (7x²+2) + (2x²+3)
= 9x² + 5
b. (5x + 2) + (8x + 3)
= 13x +5
c. (5x)(8x + 3)
= 40x² + 15x
3x³+28=220 thanks for the help!
the answer to tuis problem is x=4.
Mr. Helmer had a wooden board 85 inches long. He cut off a piece 9 inches long. How long was the board after the cut?
Answer: 76 Mr Helmer had 76 inches left.
Step-by-step explanation: All you do is you subtract 9 from 85.
Or 85-9=X
what is the rewritten answer to solve for the variable? solve 4x-2y=14 for y
4. Write a quadratic function given the roots (3, 0) and (-1, 0)
and the point (4, 10).
character character character
Drag each statement to show whether it is true, based on the graph.
The price per one pound of almonds equal $2.20/0.65 lb
0.65 pounds of almonds cost $2.20
Verify each case
case 1) The price per one pound of almonds equal $2.20/0.65 lb
The statement is true
To find the price per one pound calculate the unit rate
So,
$2.20/0.65 lb=$3.38 per one pound
case 2) 2.2 pounds of almonds cost $0.65
The statement is not True
The correct is 0.65 pounds of almonds cost $2.2
case 3) Each bag of almonds weighs 2.2 pounds
Cannot be determined
In the problem there is no information about how much each bag of almonds weighs
case 4) 0.65 pounds of almonds cost $2.20
The statement is True
The point (0.65,2.20) lie to the line of the the graph.
To know more about Drag each statement to show whether it is true, based on the graph.
Refer this link:
https://brainly.com/question/12531779
#SPJ1
Examine graphs A and B. What do you notice about the difference between the Y axis for the good graph A and the Poot graph B? How is a break shown on the Y axis of graph A
Answer:
The well-desgined graph has an appropriate scale for the y-axis. By appropriate we mean that the scale is such that all points on the graph can be discerned easily. In other words, the scale is not too wide or too narrow.
For graph A, the scale is such that the data points are at such a distance from each other that their values can be easily read off. On the other hand, for graph B, there isn't enough vertical distance between the data points for them to be easily read.
What is an equation of a line, in point-slope form, that passes through (1, - 7) and has a slope of -2/3?
Answer:
A
Step-by-step explanation:
Instructions: Determine whether the graph is a correct representation of the given inequality. If there is an error, select which error is present.
The given inequality is,
[tex]y\leq-\frac{5}{2}-4[/tex]The graph of the inequality will be shown below
Two straight lengths of wire are placed on the ground, forming vertical angles. If the measure of one of the angles formed is 72degrees, what are the measures of the other three angles? Explain your answer. (15 points and brainliest)
72, 108, and 108 are the other three angles formed by the two straight lengths of wire.
What is termed as the vertical angles?When two lines intersect, the two angles that really are opposite each other are referred to as vertical angles. Vertical angles are so named not because they are oriented vertically, but because they share a same vertex, this same point of intersection between the two lines.For the given question.
Two straight lengths of wire are put on the ground, to form vertical angles.
Because vertical angles have always been congruent, 72 is the vertical angle to 72.
Because the line is straight, the answer is 180.
180 - 73 equal 108. (supplement angles)
Because they are both vertical angles, there are two 180s.
Thus, the three angles formed are 72, 180 and 180 degrees.
To know more about the vertical angles, here
https://brainly.com/question/1673457
#SPJ13
One-Step Inequalities MC) Solve k over negative 3.7 is less than or equal to negative 2.2 for k. k ≥ 8.14 k ≤ −8.14 k ≥ −5.9 k ≤ −5.9
Answer: k>8.14
Step-by-step explanation: just do math.
Find WI if IE = 3
EW and YG are medians of XYW
Based on the definition of the median and applying the centroid theorem, the length of WI is calculated as: 6 units.
What is the Median of a Triangle?The line that joins the vertex of a triangle to the midpoint of the side it is directly opposite is called the median of a triangle.
Medians intersect each other at a point inside the triangle that is called the centroid. Based on the centroid theorem, since J is the centroid of triangle XYW, then:
the length of IE is one-third of the length of segment EW (referring to the image given in the question that shows triangle XYW)
Thus, we have the equation that relates the length of the segments as shown below:
IE = 1/3(EW)
Given that:
IE = 3 units
Substitute the value of IE into the equation:
3 = 1/3(EW)
3(3) = EW
9 = EW
EW = 9 units
Therefore:
Length of WI = the length of EW - the length of IE
Substitute
Length of WI = 9 - 3
Length of WI = 6 units.
Learn more about the median of a triangle on:
https://brainly.com/question/2288141
#SPJ1
sk-00000y5 Cog 10) -7x+2y=18 6361-30 33 42952 read 10,000 13x+40%3D2Ax0 Swazo 7-12 - 1234-5y=1722119 ターにはまった Ax - Ay=0 いりさわさったのにーちゃん 14) 42-y=20 Solve each system by elimination. 1S) 8x-6y%3D-20 ~16x+7y%3D30 y2-2142 りたい セー Crysoe Y=24 doe 24 -2x-2y= 10 JS-04-26 とおり 2012-2010 2010年10 プラス・マトリー 7 10分 16) 6x-12y = 24 yeye 一X-6y=4 Hey-400 SK-121024 ~42-30) 224.5メートル 60-124:24 カー123) 2012 ームが2012 1348
Given:
The linear equations are,
[tex]\begin{gathered} 20x-8y-22x-16=0 \\ -22x-18y=36 \end{gathered}[/tex]The objective is to solve by elimination method.
The equations can be rearranged as,
[tex]\begin{gathered} -2x-8y=16\text{ ..}\ldots..\ldots\ldots(1) \\ -22x-18y=36\text{ ..}\ldots..\ldots\ldots(2) \end{gathered}[/tex]To solve the equation, multiply equation (1) b
in the first week of July, a record 1,020 people went to the local swimming pool. In the second week, 100 fewer
people went to the pool than in the first week. In the third week, 135 more people went to the pool than in the second week.
In the fourth week, 137 fewer people went to the pool than in the third week. What is the percent decrease in the number of
people who went to the pool over these four weeks?
With the concepts of percentages and calculations, the percent decrease in the number of people who went to the pool over these four weeks is 10%
What is the way to solve percentages?Take the base as 100 and convert the percentage to numbers and then proceed with the same.
Now, the initial number of people in the local swimming pool is 1020, after which 100 fewer went, hence 920 people
Now, 135 people more people need to be added, thus 1055 people.
Now, 137 fewer people went, so 918 people went to the pool in the four weeks.
Therefore percent decrease = Difference/No. of people in the first week * 100
Thus, the percent decrease = 102/1020*100=10%
Hence 10% of people went less in the fourth week as compared to the first week.
To know more about percentages, visit:
https://brainly.com/question/13450942
#SPJ13
True or False
Corresponding angles must be proportional.
O True
O False
Answer:
True
Step-by-step explanation:
Matching sides of two or more polygons are titled corresponding sides,and matching angles are titled corresponding angles . If two figures are lookalike,then the measures of the corresponding angles are similar and the ratios of the lengths of the corresponding sides are proportional .
[tex]please \: help \: me \: i \: keep \: getting \: the \: wrong \: am \\ answer[/tex]
2. The populations of five cities in California are listed below. What is the combined population of San Diego and Fresno?
City | Population
______________________
Los Angeles | 3,928,864
______________________
San Diego. | 1,381,069
______________________
San Jose | 1,015,785
______________________
San Francisco| 852,469
______________________
Fresno | 515,986
Answer:
1,897,055
Step-by-step explanation:
1,381,069+515,986=1,897,055