The probability of boys and girls playing on school sport team is x/23 and y/23 respectively.
What is probability?A probability is a number that reflects the chance or likelihood that a particular event will occur. Probabilities can be expressed as proportions that range from 0 to 1.
This means that the addition of probability of boys and probability of girls playing in a school tem will be 1. Represent the number of boys by x and the number of girls by y.
Probability = sample space /Total outcome
Since the total number of students is 23
Therefore, the probability of boys in the team = x/23 and,
Probability of girls = y/23
therefore x/23 +y/23 = 1
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The average speed of a volleyball serve is 58 miles per hour. Natalie practiced a new technique to improve her serving speed. Her coach recorded the speed of 41 random serves during practice and found that her average speed using the new technique was 59 miles per hour, with a standard deviation of 2.7 miles per hour.
Part A: State the correct hypotheses if Natalie is trying to prove the new technique is an improvement over the old technique. (2 points)
Part B: Identify the correct test and check the appropriate conditions. (4 points) .
Part C: Carry out the test and determine if there is sufficient evidence at the 0.05 level that Natalie's technique has improved her serve speed. (4 points)
If f(x) is defined as follows, find (a) f(-3), (b) f(0), and (c) f(4).
x²
if x < 0
if x = 0
3x + 3 ifx>0
f(x) = 0
(a) f(-3)= (Simplify your answer.)
THE
For the given question the values,
f(-1) = 1f(0) = 0f(3) = 13Given value of the function when the condition for x is less than '0' is =
f(x) = x² for x < 0
The value of the function when the condition x is equals to '0' is =
f(x) = 0 for x = 0
The value of the function when the condition x is greater than '0' is =
f(x) = 3x + 4 for x > 0
From the above information,
To find f(-1) we have to use the x value as x². So, f(-1) = (-1)² = 1
To find f(0) we have to use x value as 0. So, f(0) = 0
To find f(3) we have to use the x value as 3x + 4. So, f(3) = 3(3) + 4 = 13.
From the above analysis, we find the values of f(-1), f(0), and f(3).
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Find the circumference of a circle that has a diameter of
2.75 yards. Round your answer to the nearest yard.
Answer:
3 yards
Step-by-step explanation:
What is the S-P difference (sec)?
What is the amplitude (mm)?
What is the distance (km)?
What is the magnitude (M)?
A graph is a visual representation of data that shows the relationship between two or more variables. It is also known as a chart or plot.Difference in S-P (sec):
The S-P difference is the interval of time between the arrival of the S wave and the P wave at a seismic station.We can observe from the accompanying diagram that the S wave begins to arrive at roughly 16 seconds, and the P wave begins to arrive at roughly 8 seconds. The S-P differential is therefore 16 – 8 = 8 seconds.(mm) Amplitude:
The amplitude of a seismic wave exhibits the greatest departure from the equilibrium position. We can observe from the provided diagram that the wave's maximum displacement is roughly 70 mm. Therefore, the wave's amplitude 70mm.
(km) Distance:
The S-P time difference and a journey time graph can be used to calculate how far the earthquake was from the seismic station.
Using the equation:
Distance is calculated as ((S-P time difference)*(km/sec))
where the travel time graph provides the km/sec value, we obtain:
distance = 56 km (8 * 7).
As a result, the quake's distance from the seismic station is 56 kilometres.
Magnitude (M):
An earthquake's magnitude is a logarithmic scale representation of the energy released by the earthquake. By measuring the greatest wave's amplitude (in mm) and applying the method below, we can determine the magnitude from the provided seismogram:
M = log(A) + 1.5 * log(S-P) - 3.2
where S-P is the S-P time difference in seconds, and A is the amplitude in millimetres. Inputting the numbers provided yields:
M = log(70) + 1.5 * log(8) - 3.2
M ≈ 4.1
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solve the area of the shaded region
The area of the shaded region is 117.8 m².
Given is a semicircle and a triangle in it, we need to find the area that is shaded,
So, we know that a triangle in a semicircle is always a right triangle whose hypotenuse is the diameter of the semicircle,
So, let us find the hypotenuse of the triangle (diameter of the semicircle) using the Pythagorean theorem,
diameter / hypotenuse = √21.6²+9²
= 23.4m
So the radius = 23.4/2 = 11.7 m
To find the area of the shaded region we will subtract the area of triangle from the semicircle,
So,
Area of the shaded region = π×r²/2 - 1/2×base×height
= 3.14×11.×7²/2 - 1/2×21.6×9
= 215 - 97.2
= 117.8 m²
Hence the area of the shaded region is 117.8 m².
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The list below gives the number of people who made the trip for a selection of nine summer days 2756 64 36 40 29 2756 and 30 find the range of the data set
Answer:
The range is 37
Step-by-step explanation:
highest - lowest = range
64-27= 37
Hope it helped! :)
Can you please help me with this please please
Answer:
a. 14:8
b. 6:14
Step-by-step explanation:
all books on the shelf = 6+8=14
a. 14:8
b. 6:14
The scatter plot shows the amount of money, y, Sally was paid in each of her jobs versus the number of hours x she worked in each job.
A scatter plot with number of hours worked on the X axis and amount of money paid on the Y axis. The data points are: two, 40, and, three, 70, and, four, 110, and, five, 120, and, six, 150, and, seven, 140, and, eight, 180, and, nine, 190.
Part A
Which equation best models a line of fit for the data?
A. y = 24x + 10
B. y = 21x + 11
C. y = −18x + 15
D. y = 20x
Part B
The slope of the line of fit means that for every additional hour that Sally works, she earns an additional
dollars, on average.
Using the given data, the equation that best models a line of fit for the data is y = 20x. The slope of the line of fit indicates that for each additional hour that Sally works, she earns an additional $20, on average. So, the correct option is D).
For finding the equation of the line of best fit and the slope
Firstly, Find the mean of x and y.
Mean of x = (2 + 3 + 4 + 5 + 6 + 7 + 8 + 9) / 8 = 5.5
Mean of y = (40 + 70 + 110 + 120 + 150 + 140 + 180 + 190) / 8 = 127.5
Calculate the deviations from the mean for x and y.
Deviation from mean of x = x - mean of x
= [2 - 5.5, 3 - 5.5, 4 - 5.5, 5 - 5.5, 6 - 5.5, 7 - 5.5, 8 - 5.5, 9 - 5.5]
= [-3.5, -2.5, -1.5, -0.5, 0.5, 1.5, 2.5, 3.5]
Deviation from mean of y = y - mean of y
= [40 - 127.5, 70 - 127.5, 110 - 127.5, 120 - 127.5, 150 - 127.5, 140 - 127.5, 180 - 127.5, 190 - 127.5]
= [-87.5, -57.5, -17.5, -7.5, 22.5, 12.5, 52.5, 62.5]
Calculate the product of the deviations for each data point.
Product of deviations = deviation from mean of x * deviation from mean of y
[(2-5.5) * (40-127.5)] + [(3-5.5) * (70-127.5)] + [(4-5.5) * (110-127.5)] + [(5-5.5) * (120-127.5)] + [(6-5.5) * (150-127.5)] + [(7-5.5) * (140-127.5)] + [(8-5.5) * (180-127.5)] + [(9-5.5) * (190-127.5)]
= [-135.625, -51.875, 32.625, 28.125, 17.8125, 26.25, 137.8125, 229.0625]
Calculate the sum of the deviations of x squared.
Sum of deviations of x squared = (deviation from mean of x)²
= (-3.5)² + (-2.5)² + (-1.5)² + (-0.5)² + 0.5² + 1.5² + 2.5² + 3.5²
= 70
Calculate the slope of the line of best fit.
slope = sum of products of deviations / sum of deviations of x squared
= (−135.625 + (−51.875) + 32.625 + 28.125 + 17.8125 + 26.25 + 137.8125 + 229.0625) / 70
= 20
Calculate the y-intercept of the line of best fit.
y-intercept = mean of y - slope * mean of x
= 127.5 - 20 * 5.5
= 10
The equation of the line of best fit in slope-intercept form.
y = slope * x + y-intercept
= 20x + 10
Therefore, the equation that best models a line of fit for the data is D) y = 20x, and the slope is 20. So, the correct answer is D).
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Select all the equations that have no real solutions.
A. 2x2 – 3x + 7 = 0
B. x2 – 5x + 3 = 0
C. 2x2 + 8x + 7 = 0
D. –x2 + 6x + 4 = 0
E. x2 – x + 5 = 0
Answer:
B
D
E
( all of the answers (E, D, B) have no real solutions)
A number cube with faces labeled from to will be rolled once. The number rolled will be recorded as the outcome. Give the sample space describing all possible outcomes. Then give all of the outcomes for the event of rolling a number less than . If there is more than one element in the set, separate them with commas.
The sample space describing all possible outcomes is {1. 2. 3. 4. 5. 6}
Determining the sample space describing all possible outcomes.From the question, we have the following parameters that can be used in our computation:
A number cube with faces labeled from 1 to 6 will be rolled once.
This means that
Sample space = {1. 2. 3. 4. 5. 6}
Using the above as a guide, we have the following:
The outcomes for the event of rolling the number 1 ,3 , or 4. is
Outcome = {1, 3, 4} where we have
P(1) = 1/6
P(3) = 1/6
P(4) = 1/6
Altogether, we have
P(1, 3, or 4) = 1/6 + 1/6 + 1/6
P(1, 3, or 4) = 3/6
P(1, 3, or 4) = 1/2
Hence, the probability is 1/2
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Complete question
A number cube with faces labeled from 1 to 6 will be rolled once. The number rolled will be recorded as the outcome.
Give the sample space describing all possible outcomes.
Then give all of the outcomes for the event of rolling the number 1 ,3 , or 4.
If there is more than one element in the set, separate them with commas.
If ST = -10x + 56 and PR = 23x, what is PR?
Answer:
53 es el pr espero que te ayude
The parent function is reflected across the x-axis and compressed by a factor 0.5
The rule used to obtain the transformed function is given as follows:
g(x) = -0.5f(x).
What are transformations on the graph of a function?Examples of transformations are given as follows:
Translation: Translation left/right or down/up.Reflections: Over one of the axes or over a line.Rotations: Over a degree measure.Dilation: Coordinates of the vertices of the original figure are multiplied by the scale factor.The parent function in this problem is given as follows:
f(x).
The parent function is reflected across the x-axis, hence:
g(x) = -f(x).
The parent function is also compressed by a factor 0.5, hence:
g(x) = -0.5f(x).
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Evaluate the following 2x5➕24➗4-8
Answer: 8
Step-by-step explanation:
pemdas its not that deep
help please Use inductive reasoning to predict the next number in this pattern: 3, 13, 22, 30, 37, 43…
A) 5
B) 48
C) 14
D) 50
Answer:
B) 48
Step-by-step explanation:
3, 13, 22, 30, 37, 43…
3 to 13 is +10
13 to 22 is +9
22 to 30 is +8
We are adding one less each time
3, 13 , 22, 30, 37, 43 …
+10 +9 +8 +7 +6 +5
Add 5 to 43
43+5 = 48
A cylinder with a radius of 8 inches is cut from the prisim. What is the volume of the new object
The volume of the new object is approximately 439.3 cubic inches
What is the volume of the new object?To find the volume of the new object, we need to first know the volume of the prism before the cylinder is removed hence we do this:
The volume of a cylinder: = πr²h
where:
r = radius
h = height
Note that the volume of a rectangular prism is : = lwh
l = length
w = width
h = height
Assumption: In the above case, we will assume that the dimensions of the rectangular prism because the cylinder can be cut out from the center of one of the faces.
Hence the length and width of the prism will be taken to be twice the radius of the cylinder, that is 16 inches, and the height will be taken to be same as the radius of the cylinder, that ia 8 inches.
So V_prism = lwh
= 16 × 16 × 8
= 2048 cubic inches
V_cylinder = πr²h
= π × 8² × 8
= 512 π cubic inches
Hence To get the volume of the new object, we need to subtract the volume of the cylinder from the volume of the prism:
V_new = V_prism - V_cylinder
= 2048 - 512π
= 2048 - 1608.70
= 439.3 cubic inches
Hence, the volume of the new object is about 439.3 cubic inches
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Beth pulls a slinky a distance of 24 inches from its equilibrium position and then releases it. The time for one oscillation is 2 seconds. Step 2 of 2 : Find the function in terms of t for the displacement of the slinky. Assume that the slinky is at its maximum displacement at t=0 . Also assume that the function includes no horizontal or vertical shifts.
The final function for slinky displacement is: 24 sin(t/2 - /2) d(t). This offers the displacement in inches as a function of time in seconds.
How to Solve the Problem?A sinusoidal function of the form: can be used to describe the slinky's displacement.
A sin(t + ) = d(t).
where A is the greatest displacement, is the angular frequency (2 divided by the period), and is the phase angle (starting phase).
We know the slinky's greatest displacement (amplitude) occurs at t=0, thus we have:
24 inches = d(0) = A sin()
We also know that the period is T=2 seconds because the time for one oscillation (i.e., one complete cycle) is 2 seconds. As a result, the angular frequency is:
ω = 2π / T = π radians/second
The phase angle can be calculated using the fact that the slinky is at its equilibrium position at t=T/4=0.5 seconds. At this time, the sine function's argument is:
= 2 / T = radians per second
The phase angle can be calculated using the fact that the slinky is at its equilibrium position (zero displacement) at t=T/4=0.5 seconds. At this time, the sine function's argument is:
ωt + φ = π/2
When we substitute the known values, we get:
π/2 + φ = 0.5π
φ = -π/2
As a result, the slinky's displacement function is:
A sin(t/2 - /2) = d(t).
We may utilize the information that the amplitude is 24 inches to calculate A:
A = |24| = 24
As a result, the final function for slinky displacement is:
24 sin(t/2 - /2) d(t)
This offers the displacement in inches as a function of time in seconds.
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Kelly purchased a toaster for $115. She made a down payment of 10% and financed the rest for 9 months with payments of $16.78. Find (a) the down payment and (b) the total installment price of the toaster.
(A) The down payment of the toaster = $ 11.5
(B) The total installment price of the toaster = $151.02
(A) The down payment of the toaster made by Kelly is 10 % of $ 115
Down payment = 115 × 10/100
Down payment = 1150/100
Down payment = 11.5
The down payment of the toaster = $ 11.5
(B) Total installment price of the toaster for 9 months with payment of $ 16.78
Total installment price of toaster = 9 × 16.78
Total installment price of toaster = $ 151.02
The total installment price of the toaster = is $ 151.02
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what are the answers? thank you.
Answer:
2, area=42.39 arc length=14.13
3, area=604.9 arc length=71.1
Graph the parabola.
y = (x + 5)² +2
Answer:
Vertex= (-5, 2)
Step-by-step explanation:
The vertex shifts 5 to the right (x-axis), and 2 up (y-axis) from the point of origin. Then plug in the x values to find other y values.
PLEASE HELP ME!!!!!
Write the expression of the graph the function represents.
The expression of the function which is represented by the given graph is given by,
xy = -8
The given figure is a rectangular hyperbola.
So the equation of the given graphed curve be, xy = c, where c is a constant.
We can clearly see that the curve passes through the point with coordinates (-2, 4). So it must satisfy the equation of the curve.
Substituting the point (-2, 4) in the equation of the curve xy = c we get,
(-2)*4 = c
c = -8
Hence the expression for the graph the function represents is given by,
xy = -8.
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Consider the following statements:
Which of the statement(s) regarding the "limit" concept in
Mathematics is/are TRUE and which is/are FALSE?
I
A limit is a point or value that a pattern, function or sum of
a series, approaches as the number of terms in the series
increases.
II A limit is a value that a function approximates for a given
input value.
III A limit is a value we get closer and closer to, but never
quite achieve.
I: TRUE - A limit is a value that a function, pattern, or sum of a series approaches as the number of terms or input value increases.
What is a Limit in Mathematics based on the given context?II: TRUE - A limit can also be a value that a function approximates for a specific input value, especially when dealing with continuity or differentiability.
III: FALSE - Although a limit might seem like a value that is never quite achieved, it can be reached or even exceeded, depending on the function and its behavior.
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A bag contains 605 red, 342 blue, 518 green, and 535 yellow tokens. A token is selected at random and then replaced.this is performed 2,000 times
The probability of randomly selecting a red token would be 0. 30.
How to find the probability ?First, we know that the experiment was done 2, 000 times;
605 + 342 + 518 + 535 = 2000
The probability that a red token is randomly selected is therefore:
= Red token / Total times
= 605 / 2, 000
= 0. 3025
In fractions, we can make this:
= 605 / 2, 000
= 121 / 400
This is closest to the fraction 3 / 10 which is 0. 30.
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Please see the attached
Using the ratios, 1 yd/3 feet, 1 mi/5,280 feet, and 200 yards/1 feet, the number of flags required to mark the racecourse with a flag every 200 yards is 22.
What are the ratios?Ratios are relative sizes of one quantity or value compared to another.
Ratios are depicted as fractional values using decimals, percentages, or fractions, including the standard ratio form (:).
The total distance of the racecourse = 2.5 miles
The common distance between each flag = 200 yards
1 mile = 1,760 yards
2.5 miles = 4,400 yards
1 yard = 3 feel
The number of flags required to cover the distance = 22 (4,400 ÷ 200)
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what is x^2+y^2-16x+20y-5=0 in standard form
Answer:
(x - 8)^2 + (y + 10)^2 = 169
Step-by-step explanation:
you need to do completing the square
x^2 + y^2 -16x + 20y - 5 = 0
(x)^2 - 2(8)(x) + (y)^2 + 2(10)(y) - 5 = 0
(x)^2 + 2(-8)(x) + (-8)^2 - (-8)^2 + (y)^2 + 2(10)(y) + (10)^2 - (10)^2 - 5 = 0
[(x)^2 + 2(-8)(x) + (-8)^2] + [(y)^2 + 2(10)(y) + (10)^2] - (10)^2 - (-8)^2 - 5 = 0
### (a)^2 + 2(a)(b) + (b)^2 = (a + b)^2 ###
(x - 8)^2 + (y + 10)^2 -100 - 64 - 5 = 0
(x - 8)^2 + (y + 10)^2 -169 = 0
(x - 8)^2 + (y + 10)^2 = 169
Which explanation correctly analyzes the difference between an irrational number and a rational number?
The statement that analyzes difference between an irrational number and a rational number is: the expression √25 - √21 can be rewritten as 5 - √21. since the exact value of √21 cannot be found, the difference is irrational, The Option D is correct.
What is difference between irrational number & rational number?A rational number refers to number that can be expressed as the ratio of two integers where the denominator is not zero. For example 1/2, 3/4, and -5/7 all rational numbers.
Irrational number refers to one that cannot be expressed as a ratio of two integers. Examples include pi (π) and the square root of 2 (√2).
The difference is that one is expressed as a ratio of two integers or a decimal that either terminates or repeats other cannot be expressed as a ratio of two integers and have a decimal representation that does not terminate or repeat.
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Level E: The repair department of the bicycle shop repairs three things: flat tires, bent handle bars and ripped seats. Today in the repair department, 25% of the bikes had flat tires only, 5% had bent handlebars only, and 10% had ripped seats only. Just 1/12th of the bikes had all three repairs to do: flat tires, bent handlebars and ripped seats. No bikes were completely fixed and there are a total of 101 repairs to be made. How many bikes are in the repair department? How many bikes need two repairs? If less than half of all the bikes have a ripped seat, what is the range of bikes that need both the tires and handlebars repaired without needing to fix the seat?
There are 960 bikes in the repair department and 1.98% of the bikes need two repairs.
The number of bikes with flat tires only is 0.25x, where x is the total number of bikes
The number of bikes with bent handlebars only is 0.05x
The number of bikes with ripped seats only is 0.1x
The number of bikes that need two repairs is 0.01Tx, where T is the percentage of bikes that need two repairs (expressed as a decimal)
The number of bikes that need all three repairs is 0.0833...x
So we have the equation:
0.25x + 0.05x + 0.1x + 0.01Tx + 0.0833...x = 101
Simplifying and solving for x, we get:
x = 960
So there are 960 bikes in the repair department.
To find the number of bikes that need two repairs, we can use the equation:
0.25x + 0.05x + 0.1x + 0.01Tx = 101 - 0.0833...x
Substituting x = 960, we get:
0.25(960) + 0.05(960) + 0.1(960) + 0.01T(960) = 101 - 0.0833...(960)
240 + 48 + 96 + 9.6T = 101 - 80
9.6T = 19
T = 1.98
About 1.98% of the bikes need two repairs.
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A pair of dice are tossed twice. Find the probability that the first roll is a total of at least 5 and the second roll is a total of at least 4.
The probability that the first roll is a total of at least 5 and the second roll is a total of at least 4 is 0.764 or 76.4%.
What is the probability?The probability is the chance that an expected event occurs out of many possible events.
For two independent events happening, we use the rule of multiplication of independent events based on dice probabilities.
The event that the first roll is a total of at least 5 = A
In the event that the second roll is a total of at least 4 = B
The number of faces on each die, n = 6
The probability of event A = ³⁰/₆ = ⁵/₆
The probability of event B = ³³/₃₆ = ¹¹/₁₂
Multiplying the two probabilities, P(A) and P(B) = ⁵/₆ × ¹¹/₁₂
= ⁵⁵/₇₂ = 0.764
Thus, there is a ⁵⁵/₇₂ or 0.764 chance that the first roll is at least 5 and the second roll is at least 4.
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What type of pay is modeled below?
(See chart)
A. Piece rate
B. Hourly pay with no bonus
c. Commission pay
D. Hourly pay with a bonus
The type of pay modeled in the given image is c. Commission pay.
What is commission pay?Commission pay is a form of variable pay where the employee is paid based on the percentage of sales that they make. In this case, the y-axis represents the pay earned and the x-axis represents the sales made.
The straight line represents the commission rate, which is constant at 15%. The more sales the employee makes, the more pay they will earn.
Therefore the correct option is C.
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Please help !
Part G
Fill in the table with the appropriate values of h(t) for the given values of t. Round each value to the nearest 10 meters.
Answer:0,2,4,6,8,10
Step-by-step explanation:
take it, spread it, find the bars.
Bob wants to break the school record of scoring 30 points in his basketball game. He scored 13 points in the first half. How many two point baskets must Bob make in the second half to break the school record?
Bob needs to make at least 9 two-point baskets in the second half to break the school record of scoring 30 points in his basketball game.
To break the school record of scoring 30 points, Bob needs to score more than 30 points in his basketball game. Since he scored 13 points in the first half, he needs to score at least 17 points in the second half to break the record.
Let's assume that Bob makes x two-point baskets in the second half. Since each two-point basket contributes 2 points to his score, his total score from two-point baskets would be 2x.
Therefore, to break the school record, we need to solve the following inequality:
2x + 13 > 30
Subtracting 13 from both sides, we get:
2x > 17
Dividing both sides by 2, we get:
x > 8.5
Since Bob cannot make a fractional number of baskets, he needs to make at least 9 two-point baskets in the second half to break the school record.
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