You want to sample our class. You split the class by gender and select 5 students of each gender. What type of sample is this?

The set of the value for which the curve and line have no common point are is k ∈ (0 , 4).

The value for which the line is a tangent is k = 4.

The coordinates of the point where the line touches the curves is point of tangency = ( 1/2 , 2).

What is tangent?

Tangents in geometry are lines or planes that contact curves or surfaces at points where they are closer to the curve than any other lines or planes drawn through those points.

Given equations in the question:

y = kx² + 1  

y = kx

Equating y

kx² + 1   = kx

kx² -kx  + 1 =  0

This is Quadratic equation is of the form ax²+bx+c=0  where a  , b and c are real also  a≠0.

D =  b²-4ac is called discriminant.

and we know that,

D >0 roots are real and distinct

D =0 roots are real and equal

D < 0 roots are imaginary ( not real ) and different

For no common solution  D < 0

For tangent  D = 0

so,

kx² -kx  + 1 =  0

D = (-k)² - 4k  = k² - 4k = k(k - 4)

k(k - 4) < 0

if  0 < k < 4

Hence values of k for which the curve and the line have no common points is k ∈ (0 , 4).

for tangent

k(k - 4)  = 0

k is non zero

Hence k = 4

After putting the value of k, given equations are:

y = 4x² + 1  

y = 4x

solving these equations to get value of x and y:

4x² + 1   = 4x

4x² - 4x + 1 = 0

(2x - 1)² = 0

x = 1/2

y = 2

Point of tangency = ( 1/2 , 2)

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The average pay-per-hour of the year for Elise will be 13.73 pounds.

From the information, in 2016 she earned £2100 and in 2017 she was awarded a 3% increase on her monthly salary.

Therefore, the new salary will be:

= 2100 + 3%(2100)

= 2100 + 63

= 2163

Now she worked for 42 hours per week for 45 weeks. This will be:

= 42 × 45

= 1890 hours

Therefore, the total earnings for the year will be:

= 2163 × 12 months

= 25956

The average pay-per-hour of the year will be:

= Total amount / Number of hours

= £25956 / 1890

= £13.73

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The percentage of students that use other means to travel school is  24%

Percentage is the ratio of  the number for which you want to find  percentage to the total number with which you want to compare or out of and multiply this ratio with 100.

percentage = (part / whole) ×100

Given that a school has 825 total students.

Percentage of students travelling by car = 20%

Percentage of students travelling by bus = 48%

Percentage of students travelling by bicycle = 8%

Number of students travelling by car = 20% of 825 = (20/100)×825 = 165

Number of students travelling by bus = 48% of 825

= (48/100)×825 = 396

Number of students travelling by bus  = 8% of 825 = (8/100)×825 = 66

Number of students travelling by other means = 825-165-396-66 = 198

Therefore, the Percentage of students travelling by other means  = (198/825) ×100 = 24%

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Answer:

1, -1 and 2

Step-by-step explanation:

The zeros of the given polynomial function are 1, -1 and 2

Given the polynomial function

First, we need to assume a value of x to check if it will give us zero after substituting:

Assuming x = 1

Since f(1) =0, hence x - 1 is a factor

Dividing x - 1 by the given polynomial function, we will have:

Equating the result to zero

x + 1 = 0 and x - 2 = 0

x = -1 and 2

Hence the zeros of the given polynomial function are 1, -1 and 2

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The percentage 20% of the costs y is given as 0.20y thus the expression which represents the price of the item after the discount is P = y - 0.20y.

The percentage is just like the amount of that value but between 1 to 100 and it is very useful to predict for example if you say 678 then we have to know about the full number also but if you say 80% then it becomes clear.

It is known that x% of something y is given as,

x% of y = (x/100)y

Given that discount of 20% of y

20% of y = (20/100)y

20% of y = 0.20y

Now the final price = initial price - discount

Final price (P) = y - 0.20y

Hence"The percentage 20% of the costs y is given as 0.20y thus the expression which represents the price of the item after the discount is P = y - 0.20y".

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Answer:

8.33

Step-by-step explanation:

He has to be at work by 10:30, but it takes 20 mins to walk

So, 10:30-20 minutes=10:10

We then look at the arrival time closest to this, which would mean he would arrive at 10.06.

trace this back the bus would gett him at 8:38, but its a 5min walk.

8:38-5 minutes+8.33

hope this helps :)

Answer:4

Step-by-step explanation:

image dimension = 24 by 6 feet

preimage dimension = 32 by 8 feet

so 24/6 = 32/8 = 4

scale factor = 4

The actual area of the apartment's living room is 10 [tex]m^{2}[/tex]

Given

Room is in the shape of a rectangle

Length of the room  (L)= 10 cm

Width of the room    (W) = 4 cm

Also the scale of floor plan is 2 cm for every 1 meter

Initially the are of the living room = area of rectangle

Area of the rectangle = length × width

                                   = 10 × 40

                                   = 40  [tex]cm^{2}[/tex]

To find actual floor area we need to scale the dimensions

Since 2cm = 1 m

10cm = 5m and 4 cm = 2m

Now calculating the actual area

Area = length × width

        = 5×2

        =10 [tex]m^{2}[/tex]

Hence the actual area of the living room is 10 [tex]m^{2}[/tex]

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They are similar because they have the same slope the equation is

y = -2/3x + 531

What is in slope-intercept form?

changing 2x+3y=1470 to slope intercept form is solving for y

minus 2x both sides and divide by 3

y = -2/3x + 490

the slope is -2/3

the y intercept is y=490 or the point (0,490)

to graph it, I would start at the origin and go up 490 units on the y axis and put a point there

then go -2 units up (2 down) and 3 to the right and put a point there

then connect the 2 points with a line

in function notation, replace y with f(x) to get

y = -2/3x + 490

graph below

intercepts labeled

2x+3y=1593

they are similar because they have the same slope

the equation is  y = -2/3x + 531

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the answer in scientific notation rounding to 2 decimal places is given by 68490.98

What is 6.849 times ten to the fourth power minus 2.329 times ten to the negative second power express the answer in scientific notation rounding to 2 decimal places.

6.849 *(10)^4=6.849* 10000=68490

2.329*(10)^-2= 0.02329

according to the question

6.849 times ten to the fourth power minus 2.329 times ten to the negative second power

therefore 68490-0.02329

           =68489.9767

round to 2 decimal

the answer in scientific notation rounding to 2 decimal places is given by 68490.98

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The goalpost is 15.13 meters tall which is labeled as X in the figure which has been attached below.

She walks 13.45 meters away from the goalpost, then places a mirror flat on the ground with an X in the center. She next walks 1.2 meters to the opposite side of the mirror, where she can easily see the top of the goalpost depicted in the X. Her partner determines that the distance between her eyes and the ground is 1.35 meters.

The ratio is defined as a relationship between two quantities, it is expressed as one divided by the other.

As per the given information, the figure has been attached below.

Set up the proportional and solve for x

1.2 : 13.45 = 1.35 : x

⇒ 1.2 / 13.45 = 1.35 / x

Cross multiplication, and we get

⇒ 1.2x  = 1.35 × 13.45

Divided by 1.2 into both sides of the above equation,

⇒ x = (1.35 × 13.45) / 1.2

⇒ x = 15.13

Therefore, the goalpost is 15.13 meters tall.

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He used 647.75 square meters of wrapping paper to wrap the gift.

According to the question,

We have the following information:

We have a figure made of 2 same triangles and 3 rectangles with different measurements.

Area of triangle = 1/2 * base*height

Area of triangle = (1*7*14)/2

Area of triangle = 49 [tex]m^{2}[/tex]

Now, the area of another same triangle will also be 49 [tex]m^{2}[/tex].

Now, we have:

Area of upper rectangle = length*breadth

Area of upper rectangle = 15*14

Area of upper rectangle = 210 [tex]m^{2}[/tex]

Area of middle rectangle = length*breadth

Area of middle rectangle = 15*7

Area of middle rectangle = 105 [tex]m^{2}[/tex]

Area of lower rectangle = length*breadth

Area of lower rectangle = 15.65*15

Area of lower rectangle = 234.75 [tex]m^{2}[/tex]

Now, the area of the wrapping paper will be the sum of all of these areas.

Area of paper = Area of 2 triangles + area of upper rectangle + area of middle rectangle + area of lower rectangle

Area of paper = 49+49+210+105+234.75

Area of paper = 647.75 [tex]m^{2}[/tex]

Hence, the area of wrapping paper is 647.75 [tex]m^{2}[/tex].

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The population in the year 2015 is 31296.

In 1995 the population was 7824. It was found that the population gets double every 10 years.

We have to find the population in the year 2015.

Rate = 200% = 2

Time =( 2015 - 1995) / 10

        = 20/10

        = 2

The population in 2015 = population in 1995 ×[tex]rate^{time}[/tex]

                                       = 7824 × [tex]2^{2}[/tex]

                                       = 7824 × 4

                                       = 31296

Therefore the population in the year 2015 is 31296.

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The solutions to the system of equations are x=5, z=1,y=-3

What is system of equations?

Given equations:

x+y+z=3

3x+(y/3)-2z=12

-5x-6y+3z=-4

Solving by using the substitution method:

[tex]\begin{bmatrix}x+y+z=3\\ 3x+\left(\frac{y}{3}\right)-2z=12\\ -5x-6y+3z=-4\end{bmatrix}[/tex]

Substitute x=3-y-z

[tex]\begin{bmatrix}3\left(3-y-z\right)+\frac{y}{3}-2z=12\\ -5\left(3-y-z\right)-6y+3z=-4\end{bmatrix}[/tex]

Substitute z={8y+9}/{15}

[tex]\begin{bmatrix}-y+8\left(-\frac{8y+9}{15}\right)-15=-4\end{bmatrix}[/tex]

simplify

[tex]\begin{bmatrix}\frac{-79y-72}{15}-15=-4\end{bmatrix}[/tex]

Substitute y=-3

[tex]z=-\frac{8\left(-3\right)+9}{15}[/tex]

z=1

For x=3-y-z

Substitute z=1,y=-3

x=3-(-3)-1

x=5

The solutions to the system of equations are:

x=5, z=1,y=-3

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Answer:

D

Step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b ) a point on the line

calculate m using the slope formula

m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]

with (x₁, y₁ ) = (- 2, 1) and (x₂, y₂ ) = (1, 7) ← 2 points on the line

m = [tex]\frac{7-1}{1-(-2)}[/tex] = [tex]\frac{6}{1+2}[/tex] = [tex]\frac{6}{3}[/tex] = 2

use either of the 2 points on the line

using (- 2, 1 ) , then

y - 1 = 2(x - (- 2) ) , that is

y - 1 = 2(x + 2) ← equation in point- slope form

Answer: r=-26

Step-by-step explanation:

[tex]\displaystyle\\(5,r)\ \ \ \ (10,1)\ \ \ \ slope \ m=5\\\\\boxed {m=\frac{y_2-y_1}{x_2-x_1} }\\\\x_1=5\ \ \ \ \ x_2=10\ \ \ \ \ y_1=r\ \ \ \ y_2=-1\ \ \ \ \ m=5\\\\Hence,\\\\5=\frac{-1-r}{10-5} \\\\5=\frac{-1-r}{5}[/tex]

Multiply both parts of the equation by 5:

[tex]5(5)=-1-r\\\\25=-1-r\\\\25+r=-1-r+r\\\\25+r=-1\\\\25+r-25=-1-25\\\\r=-26[/tex]

Answer:

x=-4.5 x=-0.5

y=-1

vertex=-2

The equation which is useful to find the amount in gallons of water to the number of minutes since filling started is 25 + 11x therefore, it takes 5 minutes to have 80 gallons of water.

Determine the known quantities and designate the unknown quantity as a variable while trying to set up or construct a linear equation to fit a real-world application.

The amount of water initially in the trough = 25 gallons.

The rate of adding water = 11 gallons per minute

Therefore, the total amount (A) of water in x minutes will be,

A = 25 + 11x

The number of minutes to have 80 gallons of water is,

80 = 25 + 11x

11x = 55

x = 5 minutes.

Hence "The equation which is useful to find the amount in gallons of water to the number of minutes since filling started is 25 + 11x therefore, it takes 5 minutes to have 80 gallons of water".

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Given Data:

The initial investment is: P=$100

The total period of investment is: t=3

The annual interest is: 6%.

For the simple interest, the expression to calculate the interest in t years is,

Here r is in percentage.

Substitute known values in the above expression.

Thus, the total intrest for 3 years will be $18.

The y-intercept of f(x) is equal to the y-intercept of g(x).

the y-coordinate of a point on a surface, curve, or line where they cross the y-axis.

Finding the value of y at x=0 will help you locate the y-intercept on a graph. The graph's intersection with the y-axis occurs here.

When the slope of the line being studied is known, and the provided point is also the y - intercept, the slope intercept formula, y = mx + b, is utilized (0, b). B is used in the equation to indicate the y value of the y intercept point.

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Answer:

Must be less than 12.15 dm

Step-by-step explanation:

Answer:

311/55

Step-by-step explanation:

i devided each by 2 and got this then i looked it up and it said this so id k

hope this helped

The percentage of the people surveyed that arrive at their office after 7am is 6.7%.

The percentage of the people surveyed that arrive at their office after 7:59 am is 64%

From the information, Miranda did a survey of what time people get to their office on Monday morning and the table shows her results.

The number of people that arrived before 7.59am is 15.

The total number of people surveyed will be:

= 15 + 39 + 75 + 21

= 150

The percentage of the people surveyed arrive at their office before 7 am will be:

= 10 / 150

= 6.7%

The percentage of the people surveyed that arrive at their office after 7:59 am will be:

= (75 + 21) / 150.

= 96/150

= 0.64

= 64%

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Answer:

the number of people is 15 so you would do 15/150=10percent

b) 66 percent

Step-by-step explanation:

Answer:

This is your graph to the following equation f(x) = 1/4(x) - 7

Answer:

See below

Step-by-step explanation:

y  =  -(x-1)^2 +4       Expand  R side

y = - ( x^2 -2x+1) + 4

y = -x^2 +2x -1  + 4

y = -x^2 + 2x + 3          a = -1     b = 2    c   = 3  

Assume √2 is rational, so

√2 = p/q

for some relatively prime integers p,q - meaning we can't reduce p/q any further - and q ≠ 0.

Then

p = √2 q

and squaring both sides gives

p² = 2q²

This tells us that p² is even, so 2 divides p². But if 2 divides p², it must also divide p, since p is a square number. So p = 2r for some integer r, and we have

(2r)² = 2q²

4r² = 2q²

2r² = q²

We're in the same situation as before - 2 divides q², so 2 divides q. Both p and q are thus divisible by 2, but this contradicts our assumption that p and q are relatively prime, which means √2 cannot be expressed as a rational number p/q. Therefore √2 is irrational.

What you've written in your proof is technically correct, but it doesn't help in the irrationality proof.

Answer:

the answer is 101 !!!

There's isn't nothing strange your just over thinking it!