Answer:
[tex]\frac{20}{9}[/tex] square feet
Step-by-step explanation:
We are given that
Side of square tile=[tex]\frac{1}{3} foot[/tex]
Total number of tiles used in rectangular floor=20
Area of square=[tex](Side)^2[/tex]
Area of square tile=[tex](\frac{1}{3})^2=\frac{1}{9}[/tex]square feet
Area of rectangular floor covered by square tiles =Area of 20 square tiles
Area of rectangular floor covered by square tiles=[tex]20\times \frac{1}{9}[/tex] square feet
Area of rectangular floor covered by square tiles=[tex]\frac{20}{9}[/tex] square feet
Hence, the area of rectangular floor covered by square tiles=[tex]\frac{20}{9}[/tex] square feet
The volume of a cone of radius r and height h is given by V=πr²h³. If the radius and the height both increase at a constant rate of 12 cms/sec, at what rate, in cubic centimeters per second, is the volume increasing when the height is 9 centimeters and the radius is 6 centimeters?
Answer:
The volume of cone is increasing at a rate 1808.64 cubic cm per second.
Step-by-step explanation:
We are given the following in the question:
[tex]\dfrac{dr}{dt} = 12\text{ cm per sec}\\\\\dfrac{dh}{dt} = 12\text{ cm per sec}[/tex]
Volume of cone =
[tex]V = \dfrac{1}{3}\pi r^2 h[/tex]
where r is the radius and h is the height of the cone.
Instant height = 9 cm
Instant radius = 6 cm
Rate of change of volume =
[tex]\dfrac{dV}{dt} = \dfrac{d}{dt}(\dfrac{1}{3}\pi r^2 h)\\\\\dfrac{dV}{dt} = \dfrac{\pi}{3}(2r\dfrac{dr}{dt}h + r^2\dfrac{dh}{dt})[/tex]
Putting values, we get,
[tex]\dfrac{dV}{dt} = \dfrac{\pi}{3}(2(6)(12)(9) + (6)^2(12))\\\\\dfrac{dV}{dt} =1808.64\text{ cubic cm per second}[/tex]
Thus, the volume of cone is increasing at a rate 1808.64 cubic cm per second.
Final answer:
The volume of a cone can be found using the formula V = πr²h³. To find the rate at which the volume is increasing, we differentiate the volume formula with respect to time and substitute the given values into the derivative formula. The volume is increasing at a rate of 15552π cubic centimeters per second.
Explanation:
To find the rate at which the volume is increasing, we need to differentiate the volume formula with respect to time.
Let's differentiate the volume formula V = πr²h³ with respect to time t:
dV/dt = π(2rh³(dr/dt) + r²h²(dh/dt))
Given that dr/dt = dh/dt = 12 cm/sec, r = 6 cm, and h = 9 cm, we substitute these values into the derivative formula:
dV/dt = π(2(6)(9³)(12) + (6²)(9²)(12))
dV/dt = π(11664 + 3888)
dV/dt = 15552π
Therefore, the volume is increasing at a rate of 15552π cubic centimeters per second.
find two numbers that multiply to 17 and add to 18
Answer:
The numbers are 1 and 17
Step-by-step explanation:
The only factors of 17 are 1 and 17 since 17 is a prime number
1*17 =17
1+17 =18
The two numbers that multiply to 17 and add to 18 are 1 and 17.
To find two numbers that satisfy the conditions of multiplying to 17 and adding to 18, we can set up a system of equations based on these criteria.
Let the two numbers be x and y .
1. Set up the equations:
- [tex]\( xy = 17 \)[/tex] (product of the numbers)
- [tex]\( x + y = 18 \)[/tex] (sum of the numbers)
2. Solve the system of equations:
From x + y = 18, express y in terms of x :
[tex]\[ y = 18 - x \][/tex]
Substitute y = 18 - x into [tex]\( xy = 17 \)[/tex]:
[tex]\[ x(18 - x) = 17 \][/tex]
[tex]\[ 18x - x^2 = 17 \][/tex]
[tex]\[ x^2 - 18x + 17 = 0 \][/tex]
3. Find the roots of the quadratic equation:
Use the quadratic formula [tex]\( x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \)[/tex], where a = 1 , b = -18, and c = 17:
[tex]\[ x = \frac{-(-18) \pm \sqrt{(-18)^2 - 4 \cdot 1 \cdot 17}}{2 \cdot 1} \][/tex]
[tex]\[ x = \frac{18 \pm \sqrt{324 - 68}}{2} \][/tex]
[tex]\[ x = \frac{18 \pm \sqrt{256}}{2} \][/tex]
[tex]\[ x = \frac{18 \pm 16}{2} \][/tex]
So, [tex]\( x = \frac{34}{2} = 17 \)[/tex] or [tex]\( x = \frac{2}{2} = 1 \)[/tex].
4. Determine the corresponding y values:
- If x = 17, then [tex]\( y = 18 - 17 = 1 \)[/tex].
- If x = 1 , then [tex]\( y = 18 - 1 = 17 \)[/tex].
Therefore, the two numbers that multiply to 17 and add to 18 are 1 and 17.
The numbers 1 and 17 satisfy the conditions of multiplying to 17 and adding to 18, providing a clear solution based on the given criteria of the problem.
For five days, several hikers walk the distance and direction described by the vector
⟨5, –2⟩ each day. The next day, they walk the distance and direction described by the vector ⟨–1, 8⟩. At the end of the six-day trip, what is their bearing from their starting location?
Answer:
94.76°
Step-by-step explanation:
Assuming the coordinates are <E, N>, the total distance from the start is ...
5<5, -2> +<-1, 8> = <5·5 -1, 5(-2) +8> = <24, -2>
These coordinates represent a vector south of east, so the bearing measured clockwise from north will be greater than 90°. The reference angle (with respect to a north-south line) will be ...
arctan(24/2) = 85.24°
The bearing is 180° -85.24° = 94.76°.
hellplppppppp800x40÷80=
Answer:
400
Step-by-step explanation:
Answer:
800*400/80=400
Step-by-step explanation:
To work this out you would first start with 40/80. This is because when using BODMAS / BIDMAS you would start with whatever operation that comes first out of all the operations in the question. This gives you 0.5. Then you would multiply 0.5 by 800, this gives you 400.
1) Find what operation you should do first.
B- Brackets
O -Orders
D-Division
M-Multiplication
A-Addition
S-Subtraction
2) Divide 40 by 80.
[tex]40/80=0.5[/tex]
3) Multiply 0.5 by 800.
[tex]0.5*800=400[/tex]
PLEASE HELP
What is the volume, in cubic m, of a cube with an edge length of 14m?
Answer:
v = 2744 m³
Step-by-step explanation:
Volume of cube
= length³
= l³
= 14³
= 2744 m³
make as the brainliest
Final answer:
The volume of a cube with an edge length of 14m is 2,744 cubic meters (m³), calculated using the formula V = a³, where a is the edge length.
Explanation:
To find the volume of a cube with an edge length of 14m, we use the formula for the volume of a cube, which is V = a³, where a is the length of an edge of the cube. In this case, each edge is 14 meters long. Therefore, the volume of the cube is calculated as follows:
V = 14m × 14m × 14m = 2,744 m³
This means the volume of the cube is 2,744 cubic meters (m³). It's important to remember that the volume measures the amount of space within the cube, and the unit of measure for volume in the International System of Units (SI) is cubic meters (m³).
x² +10x+3=0
how do I slove it with the quadratic formula?
Answer:
Step-by-step explanation:
The equation is already in standard form [ ax² + bx + c = y ] so we can find the values of each variable.
a = 1
b = 10
c = 3
y = 0
Quadratic formula: [tex]x = \frac{-b+-\sqrt{b^2-4ac} }{2a}[/tex]
Solve using the formula:
[tex]x=\frac{-10+-\sqrt{10^2-4(1)(3)} }{2(1)}[/tex]
[tex]x=\frac{-10+-\sqrt{100 - 12} }{2}[/tex]
[tex]x=\frac{-10+-\sqrt{88} }{2}[/tex]
[tex]x=-5+-\sqrt{22}[/tex]
Therefore, the answer is [ x = -5 ± √22 ]
Best of Luck!
Ryan charges his neighbors $17.50 to wash their car. How many cars must he wash next summer if his goal is to earn at least $1,500?
Answer:
86 cars
Step-by-step explanation:
1,500/17.50=85.71 so you just round it a little
He must wash 86 cars.
What is division?The division is one of the basic arithmetic operations in math in which a larger number is broken down into smaller groups having the same number of items. It is the process of repetitive subtraction. It is the inverse of the multiplication operation. It is defined as the act of forming equal groups.
Example: 4 / 2 = 2.
Given, Ryan charges his neighbors $17.50 to wash their car.
So, he earns $17.50 per car.
Let Ryan washes x cars to earn $1500
$17.50(x)=$1500
x = $1500/$17.50
x = 85.71 ≈ 86
Hence, Ryan needs to wash 86 cars to earn at least $1500.
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Identifying Characteristics of the Exponential Function y = bx (b > 1)
The domain of an exponential function is . The range of an exponential function is .
On a coordinate plane, the graph of y = 2 Superscript x is shown. The curve approaches the x-axis in quadrant 2 and then increases quickly into quadrant 1.
Answer:
domain (-∞, ∞)range (0, ∞)Step-by-step explanation:
The domain is the horizontal extent: all real numbers. -∞ < x < ∞.
The range is the vertical extent: all numbers greater than zero. 0 < y < ∞. (The graph never actually touches y=0, but comes arbitrarily close.)
find an angle in the normal range (0 degrees to 360 degrees, or 0 to 2pi radians) whose terminal side points in the same direction as the terminal side of an angle measuring -11pi/3.
Answer:
a) pi/3
Step-by-step explanation:
-11pi/3 + 4pi
(-11+12)pi/3
pi/3
Answer:
A
Step-by-step explanation:
We see that the angle is -11[tex]\pi[/tex]/3, which means that when drawing this angle on the graph, we need to move clockwise from 0 (see the drawing).
We see that this angle is actually the exact same as an angle in the first quadrant. This angle is [tex]\pi[/tex]/3.
Thus, the answer is A.
Hope this helps!
For this question please tell me if I'm right or wrong. If I'm wrong please correct me.
Please use the following image below in order to answer the question correctly:
Tell whether NL is best described as a radius, chord, diameter, secant, or tangent of ⊙P.
What can NL be best described as?
Please show all the work on how you got your answer. ( I'm not asking for an explanation. All I want is the work shown so I can understand how you got your answer)
Answer:
You right in this one.
Step-by-step explanation:
Answer:
D) secant
Step-by-step explanation:
NL doesn't pass through the centre, so not radius or diameter
Passes through two points on the circle so not a tangent
Extends to a point outside the circle, so not a chord
Mrs. Garcia has two kinds of flowers in her garden. The ratio of lilies to daisies in the garden 3:2 if there are 15 lilies, what is the total number of flowers in her garden?
Answer:
The total number of flowers in Mrs. Garcia's garden is 25.
Step-by-step explanation:
The ratio of lilies to daisies is 3:2 and there are 15 lilies. We need to compute the number of daisies first and then add both the number of daisies and lilies to compute the total number of flowers. Using the ratio method:
Lilies : Daisies
3 : 2
15 : x
By cross multiplying we get:
3x = 15*2
3x = 30
x = 10
Hence, the total number of flowers in the garden are:
10 + 15 = 25
The total number of flowers in Mrs. Garcia's garden is 25.
Answer:
25
Step-by-step explanation:
Given that the number of lilies = 15
Given ratio = 3:2
Let the total number of flowers be X
Let the number of daisies be 'a'
3/2 = 15/a
3×a = 2×15
3a = 30
a = 30/3
a = 10
X = number of lilies + number of daisies
X = 15 + 10
X = 25
We have 2 stacks or styrofoam cups one has 6cups and it's height is 15cm.The other stack has 12cups and Height is 23cm. How many cups are needed for a stack with the height of 50cm?
Answer:
Given
Number of stacks = 2
Stack 1 = 6 cups; h1 = 15cm
Stack 2 = 12 cups; h2 = 23cm
Let's first find the average:
[tex] \frac{H_1 - H_2}{ n_1 - n_2}[/tex]
[tex]= \frac{15-23}{6-12} [/tex]
[tex] = \frac{-8}{-6} = \frac{4}{3} [/tex]
With an average of 4/3, to obtain the number of cups needed to obtain a height of 50m, we have:
50 / (4/3)
= 50 * 3/4
= 150/4
= 37.5
From the answer, we can see that the number of cups is not really proportional to the height of the stack, because the average of stack one and stack 2 are different.
Bottles of a popular cola drink are supposed to contain 300 ml of cola. There is some variation from bottle to bottle because the filling machinery is not perfectly precise. The distribution of the contents is normal with standard deviation of 3 ml. A student who suspects that the bottler is under-filling measures the contents of six bottles. The results are:299.4 297.7 301.0 298.9 300.2 297.0Is this convincing evidence that the mean contents of cola bottles is less than the advertised300 ml? Test at the 5% significance level.
Answer:
No because there is sufficient statistical evidence to suggest that the mean contents of cola bottles is equal to 300 ml as advertised
Step-by-step explanation:
Here we have the measured contents as
299.4
297.7
301.0
298.9
300.2
297.0
Total = 1794.2
∴ Mean = 299.03
Standard deviation = 1.5
We have
[tex]z=\frac{\bar{x}-\mu }{\frac{\sigma }{\sqrt{n}}}[/tex]
Where:
[tex]\bar x[/tex] = Mean of sample = 299.03 ml
μ = Mean of population = 300 ml
σ = Standard deviation of population = 3 ml
n = Sample size = 6
α = 5% = 0.05
We set our null hypothesis as H₀ = 300 ml
Our alternative hypothesis is then Hₐ < 300 ml
Therefore, z = -0.792
The probability from z table is P = 0.2142
Since the P value, 0.2142 is > than the 5% significance level, 0.05 we accept the null hypothesis that the mean contents of cola bottles is 300 ml.
Parking at a university has become a problem. University administrators are interested in determining the average time it takes a student to find a parking spot. An administrator inconspicuously followed 240 students and recorded how long it took each of them to find a parking spot. Identify the population of interest to the university administration.
Answer:
In this particular case,the target population of interest to the university administration constitutes the university students.Step-by-step explanation:
The university administration is interested to conduct a statistical study to identify the average or mean time taken by the students to find a vacant parking spot.Therefore,the research topic here is the average time taken by the university students to find parking spot. The administrator collects an inconspicuous sample of 240 samples from the target population of the study,which is the overall student population of the university.The sample collected by the university administration is used to observe the average or mean parking time by the university students.(3x+5) is a factor of the polynomial (a-1)x^3 + (a+1)x^2 - (2a + 1)x - 15. Find the value of 'a'. For this value of 'a', factorize the given expression completely.
Answer:
(3x + 5)(x + √3)(x - √3)
Answer:
a = 4
Step-by-step explanation:
(3x+5) is a factor of the polynomial (a-1)x³ + (a+1)x² - (2a + 1)x - 15
Means x = -5/3 is a root
(a-1)(-5/3)³ + (a+1)(-5/3)² - (2a + 1)(-5/3) - 15 = 0
-125a/27 + 125/27 + 25a/9 + 25/9 + 10a/3 + 5/3 - 15 = 0
a(-125/27 + 25/9 + 10/3) = 15 - 5/3 - 25/9 - 125/27
a(40/27) = 160/27
a = 4
The table shows employment status for 1600 adults from five countries. Are the events S = "is Swedish" and E = "is employed"
independent? Why or why not?
Answer:
Yes; because P(S & E)= P(E) • P(E).
Step-by-step explanation:
P(S)=530/1600 = 0.33, P(E)= 1523/1600= 0.95, and P(S & E)= 498/1600= 0.31 = (0.33)(0.95)
Marta and Kim are sisters. Five years ago Kim's age was twice as great as martas age. If Marta is no m years old, what expression represents Kim's age now?
Answer:
y = 2m-5
Kim's age now is y = 2m-5
Step-by-step explanation:
Let m represent martas age now and y represent Kim's age now
Given;
Five years ago Kim's age was twice as great as martas age.
(y-5) = 2(m-5)
Solving for y;
y-5 = 2m-10
y = 2m-10+5
y = 2m-5
Kim's age now is y = 2m-5
Final answer:
Kim's current age is represented by the expression 2m - 5, where m is Marta's current age. This is determined by considering the age difference and relationship of their ages five years ago.
Explanation:
The question is about determining Kim's current age given that Marta is currently m years old and five years ago Kim's age was twice that of Marta's. To solve this, we can follow these steps:
Let's represent Marta's age five years ago as m - 5.
Since Kim's age was twice Marta's age five years ago, we express Kim's age at that time as 2(m - 5).
To find Kim's current age, we add five years to her age at that time: 2(m - 5) + 5.
Simplifying the expression gives us Kim's current age as 2m - 5.
Therefore, the expression that represents Kim's age now, given that Marta is m years old, is 2m - 5.
Is it A)50 degrees, B) 60 degrees C) 74 degrees or D) 78 degrees
If the slope of the linear function y=-2x-4 was changed to 3, what would the new equation be? *
A. y=2x-3
B. y=3x-4
C. y=2x+3
D. y=3x+4
Answer:
b
Step-by-step explanation:
-2 is the slope so change -2 to 3
To win at LOTTO in a certain state, one must correctly select 6 numbers from a collection of 52 numbers (1 through 52). The order in which the selections is made does not matter. How many different 6-number selections are possible?
Answer:
The answer is 20,358,520
Step-by-step explanation:
Selecting 6 numbers from a collection of 52 numbers regardless of order involves a combination.
Note: if regards was taken into order of selection, this would be a permutation.
Hence, the different 6 number selections out of 52 is
52C6 = 52! / [6!*(52-6)!]
= 52!/(6!*46!)
= 20,358,520
what does x equal in this equation x−9.37+5.77=1.3x
Answer:
-12
Step-by-step explanation:
x-9.37+5.77=1.3x
At a high school with over 500 students, a counselor wants to estimate the mean number of hours per week that students at the school spend in community service activities. The counselor will survey 20 students in the Environmental Club at the school. The mean number of hours for the 20 students will be used to estimate the population mean.Which of the following conditions for inference have not been met?1. The data are collected using a random sampling method.2. The sample size is large enough to assume normality of the distribution of sample means.3. The sample size is less than 10 percent of the population size. A. II onlyB. III onlyC. II and III onlyD. I, II, and III
Population distribution is probability distribution that measures the frequency of sample provided. For the given problem condition I and III are met for the inference but condition II does not met. Thus the option A is correct option.
Given-Total students 500.
Total students surveyed by the counselor is 20.
Population distribution
Population distribution is probability distribution that measures the frequency of sample provided.
I)The data are collected using a random sampling method- All the students surveyed by the counselor is 20 is collected using a random sampling method. Hence the condition I is met for the inference.II) The sample size is large enough to assume normality of the distribution of sample means- The sample size for the given problem is 20. For a large population the sample size must equal to or greater than the 30.Hence the condition II is not met for the inference.III)The sample size is less than 10 percent of the population size- We have total student 500. The 10 percent of the population size is,[tex]P=\dfrac{10\times500}{100}[/tex]
[tex]P=50[/tex]
Here the 10 percent of the population size is 50. Our sample size is 20. Thus the sample size is less than 10 percent of the population size.Hence the condition III is met for the inference.
Hence, for the given problem condition I and III are met for the inference but condition II does not met. Thus the option A is correct option.
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Can someone help solve for X
Answer:
x = 2sqrt(5)
Step-by-step explanation:
We can use the Pythagorean theorem to solve
The legs are x and 8/2 =4
and the hypotenuse is 6
a^2 + b^2 = c^2
x^2 +4^2 = 6^2
x^2 +16 = 36
Subtract 16 from each side
x^2 +16-16=36-16
x^2 = 20
Take the square root of each side
sqrt(x^2) = sqrt(20)
x = sqrt(4*5)
x = sqrt(4) sqrt(5)
x = 2sqrt(5)
Answer:
Step-by-step explanation:
What is the answer to this? I need help :(.
Answer:
Not proportional
Step-by-step explanation:
Hope it helps you in your learning process.
[tex] \frac{6}{6}=1\\\\
\frac{8}{24}= \frac{1}{3}\\\\
\frac{10}{50}= \frac{1}{5}\\\\
\frac{12}{84}= \frac{1}{7}\\\\
\therefore \frac{6}{6}\neq \frac{8}{24}\neq \frac{10}{50}\neq \frac{12}{84}[/tex]
Hence, given ratios are not proportional.
Which lists the steps in the correct order to find the median of this data set?
24, 16, 23, 30, 18, 29
Answer:
23.5
Step-by-step explanation:
you put it in order and find the middle in this case is 23 and 24 then you add them and divide by two and get 23.5
Really need to know this for math!
Which number represents 10. Helpful if you answer all the rest ASAP
Answer:
I had to look up the problem B4 because your image doesn't show the rest of the information
B4 = 12
B5 = 1,738
Step-by-step explanation:
if you need help on any other questions on this, i can't see them in the image
Which of these equations correctly represents the following scenario: In her prime, 40 million people knew who Britney Spears was, but that number has been decreasing by 10% each year. So, since 90% of people still recognize her each year, how many people still know who Britney is each year?
y = 40,000,000(0.9)x
y = 0.9(40,000,000)x
y = 40,000,000(0.01)x
y = 0.1x + 40,000,000
y = 0.01(40,000,000)x
Answer:
Its the first option
40,000,000(0.9)x.
Step-by-step explanation:
90% recognise her each year so after 1 year so the number (N) is:
N = 40,000,000(0.90)^1 = 36,000,000 recognise her after 1 year.
N = 40,000,000(0.90)^2 = 32,400,000 recognise her after 2 yeas
- and so on.
After x years:
N = 40,000,000(0.90)^x.
Note the x is a power and is best written as ^x.
The correct equation to represent the given scenario is [tex]y = 40,000,000(0.9)^x[/tex]. This equation represents a geometric sequence, with the initial quantity being 40,000,000 and decreasing by 10% each year.
Explanation:The scenario is a geometric sequence, where the number of people who still recognize Britney Spears each year is decreasing by 10%. To represent this situation mathematically, we can use a geometric equation: [tex]y = a \cdot r^x[/tex]where 'a' is the initial quantity, 'r' is the ratio of decrease or increase, and 'x' is the number of time periods.
In this case, 'a' is 40,000,000 (the initial amount of people), 'r' is 0.9 (representing a 10% decrease each year), and 'x' will represent the number of years since her prime. Thus, the correct equation out of the options to represent the scenario is [tex]y = 40,000,000(0.9)^x.[/tex]
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A box of cereal has a volume of 336 cubic inches. If the width of the box is 4 inches and the length is 7 inches, what is the height of the box
I'm confused
Answer:
12 inches
Step-by-step explanation:
Volume = length × width × height
336 = 4 × 7 × height
height = 12
Answer:
12 cubic inches.
Step-by-step explanation:
Since volume is length x width x height, you just do 7 x 4 (28) and then the total, 336 and divide that by 28. So, 12 cubic inches!
For a research project on rodents, 60 groundhogs were tagged and released. Later, researchers
counted 700 groundhogs, 12 of which had tags. To the nearest whole number, what is the best
estimate for the groundhog population?
The estimated size of the lemur population can be calculated using the mark and recapture technique.
Explanation:The estimated size of the lemur population can be calculated using the mark and recapture technique. The formula to estimate population size is:
N = (M * C) / R
where N is the estimated population size, M is the number of marked individuals in the second capture, C is the total number of individuals in the second capture, and R is the number of marked individuals recaptured in the second capture.
In this case, the number of marked individuals in the second capture is 11, the total number of individuals in the second capture is 49, and the number of marked individuals recaptured is 11. Plugging these values into the formula:
N = (11 * 49) / 11 = 49
Rounding to the nearest whole number, the estimated size of the lemur population is 49.
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Use properties of rational number to simplify the expression.
A.)129/7
B.)262/15
C.)122/7
D.)507/28
Answer:
A.)129/7
Step-by-step explanation:
25/4 + 24/7 + 35/4
I will add the two with common denominator together first
25/4 + 35/4 +24/7
60/4 +24/7
15 + 24/7
We need to get a common denominator of 7
15 *7/7 + 24/7
105/7 + 24/7
129/7