The difference of 2 times a number and -19 is -5. Find the number.

Answer:

Step-by-step explanation:

To construct this rhombus, we will need a compass and a straightedge.

Step 1: Using the compass, draw two arcs intersecting at point E with the radius of 5.6 cm from B and D respectively.

Step 2: With the same radius, draw two more arcs intersecting at point N from both sides of point E.

Step 3: Draw a straight line from D to E and from E to N.

Step 4: Now draw a line from B to N with the same radius used in Step 2.

The resulting shape is the rhombus BEND with side lengths of 5.6 cm and 6.5 cm.

The scale of the model is 0.00017 ft/in, or in inches per foot.

To determine the scale of the model, we need to find the ratio of the size of the model to the size of the real room. We can use the information provided about the total surface area of the model to find this ratio.

The total surface area of the model is given as 2,304 square inches. We can find the total surface area of the real room by multiplying the lengths of the four walls and the floor.

The inside dimensions of the room are given as 8 ft x 12 ft x 8 ft x 12 ft x 8 ft = 8 x 12 x 8 x 12 x 8 = 92,160 sq ft

Now we can find the ratio of the size of the model to the size of the real room by dividing the surface area of the model by the surface area of the real room and converting it to inches per foot.

2,304 sq in / 92,160 sq ft = 0.025 sq in/ sq ft

To convert square inches to square feet we divide by 144, so 0.025 sq in/ sq ft = 0.025/144 = 0.00017 ft/in

So, the scale of the model is 0.00017 ft/in, or in inches per foot.

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Sarah's new total cost will be $1,685.73 including 15% gratuity.

To find the new total cost, we can first calculate the cost of shipping, which is 2% of the total cost of the computer repair.

Shipping = 2% * 1,444.50 = 28.89

We can then subtract the shipping cost from the original total cost to find the cost of the computer repair, excluding shipping.

Computer repair cost (excluding shipping) = 1,444.50 - 28.89 = 1,415.61

Now we can add the 15% gratuity to the cost of the computer repair, excluding shipping:

Gratuity = 15% * 1,415.61 = 212.34

Finally, we can add the gratuity and shipping cost back to the original cost of the computer repair to find the new total cost:

New total cost = 1,444.50 + 28.89 + 212.34 = $1,685.73

So, Sarah's new total cost will be $1,685.73 including 15% gratuity.

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Therefore , the solution of fraction problem is number of guests in the dinner were 72.

A fraction is referred to as the portion of a whole in mathematics. For instance, if a pizza is cut into four equal pieces, each one is represented by a quarter. Fractions make calculations quicker and easier by making it easier to distribute and judge numbers.

Here,

Given :

Let the number of guests be x,

2 persons shared a can of beer. 3 persons shared a jar of fruit punch. 4 persons shared a bottle of wine ++78

12+8x+6x 24

26x = 1872

x = 72

= 78

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The pounds that they would have to each recycle so that they earned the same amount of money from the recycle center is 30 pounds.

Equations that depict the revenue from recycling electronics and appliances are:

The following calculation can be used to calculate how much money Solomon can make by recycling appliances:

p = $0.60a

Solomon's potential earnings from recycling electronics are represented by the equation p = $1.50e - $27.

Here,

p = amount earned

a = pounds of appliances recycled

e = number of electronics recycled

The equation that depicts Solomon's earnings when he makes the same amount of money would be the same as the equation that describes his earnings when recycling gadgets.

$1.50e - $27 = $0.60e

To determine the number of pounds:

Combine and add similar terms

$1.50e - 0.60e = $27

$0.90 = $27

Dividing both sides of the equation by 0.9, we get

$27/ 0.9 = 30 pounds

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The complete question is:

"After reading about earning money by recycling, Solomon and Marcus are excited to do some recycling themselves. Solomon has some electronics his parents said he could recycle. Marcus has permission to recycle some small household appliances. They looked online and discovered that the local recycling center offers $0.60 per pound for the appliances and $1.50 per pound for the electronics. But there is a $27 hazardous waste fee that has to be paid to recycle electronics, no matter how much you recycle.

Write one equation that represents how much Solomon would earn by recycling electronics. Write another equation that represents Marcus earns from recycling appliances. How many pounds would they have to each recycle so that they earned the same amount of money from the recycle center?"

Therefore , the solution of the given problem of  expression comes out to be 15 years: 75 years

In mathematics, it is possible to multiply, divide, add, or remove. The construction of an expression is as follows: Expression, number, and mathematical operator Numbers, variables, and functions are the building blocks of a mathematical expression (such as addition, subtraction, multiplication or division etc.) Expressions and phrases can be contrasted. Any mathematical statement with variables, numbers, and an arithmetic operation between them is called an expression or an algebraic expression. For instance, the expression 4m + 5 has the terms 4m and 5 as well as the variable m of the supplied expression, all of which are separated by the arithmetic sign +.

Here,

an expression to represent a dog's age in dog years for a dog that is at least two years old in order to respond to the inquiry above. if x represents human age

then the dog is 2 years older

X = human years

x + 2 =  is for the dog age

For 75 years

15 years: 75 years

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a) Maths was the third most popular subject, according to the chart showing the results for the most popular subjects using their percentages.

b) About 10 percent of the students chose Maths.

The percentage is the ratio of one variable or value compared to another.

Percentages are proportional values.  They are obtained as the quotient of one value (the numerator) divided by another value (the denominator) before being multiplied by 100.

Subject   Percentage

Art                 30%

History          20%

Maths            10%

Thus, based on the percentage of popular subjects, 10% chose Maths as the third most popular subject.

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sin T as a fraction in simplest terms is 7/17

Trigonometry is a branch of mathematics dealing with the relationship between the ratios of the sides of a right-angled triangle with its angles.

Sin T = opposite/ hypotenuse

The opposite is where the angle T is facing. That is opposite = 7.

The hypotenuse is where the right angle is facing. That is hypotenuse = 17

Thus, Sin T = 7/17

We cannot further simply sin T.

Therefore, the value of sin T as a fraction in simplest terms is 7/17

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The first five terms of the sequence [tex]a_n = 3n/(n+4)[/tex] are:

3/5, 3/4, 9/7, 3/2, 15/9.

What is a sequence?

A sequence in A.P stands for "Arithmetic Progression" which is a sequence of numbers in which each term is the sum of the previous term and a constant called the common difference.

Now the given expression is

To find the first five terms of the sequence [tex]a_n = 3n/(n+4),[/tex] we need to substitute the values of n from 1 to 5 and solve for [tex]a_n[/tex].

a1 = 3*1/(1+4) = 3/5

a2 = 3*2/(2+4) = 3/4

a3 = 3*3/(3+4) = 9/7

a4 = 3*4/(4+4) = 12/8 = 3/2

a5 = 3*5/(5+4) = 15/9

Hence, the first five terms of the sequence [tex]a_n = 3n/(n+4)[/tex] are:

3/5, 3/4, 9/7, 3/2, 15/9.

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At point, the parametric curve cross (4, 1, 32).

t functions expressed as x = f(y) = y = f(x) = (some function of the variable x) (some function of the variable y).

It is frequently more easier to view functions of two or more variables (although we'll keep it at two here) as parametric functions, particularly in physical science.

The introduction of the idea of time makes parametric functions the most simple to understand.

Imagine tracing a parabola-like function from left to right as time passes.

Then, it is simple to begin considering how the x-coordinate and the y-coordinate change as a function of time: x = f(t), y = g. (t). In this sense, time is actually referred to as the parameter.

We will investigate functions for which a point exists in this section.

Hence, At point, the parametric curves cross (4, 1, 32).

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Answer: We can use the formula for the sum of an arithmetic series to find the number of pages in the Funny Book. The formula is:

S = n/2 (2a + (n-1)d)

Where S is the sum of the series, n is the number of terms, a is the first term, and d is the common difference.

In this case, the series is the page numbers, a = 1, d = 1, and we know that there is no page numbered "21" but the page numbered "20" is there.

The number of pages numbered 20 is 20, and the number of pages numbered 19 is 19. So n = 20 + 19 = 39

By substituting the values into the formula

S = 39/2 (2*1 + (39-1)1) = 3920 = 780

The greatest number of pages that the Funny Book can have if it contains a page numbered 20 but not any that are numbered 21 is 780.

Step-by-step explanation:

The value of sin(π/6) is 0.50.

Trigonometric functions—also referred to as circular functions—are the functions of a triangle's angle. This means that these trig functions provide the relationship between the angles and sides of a triangle. Sine, cosine, tangent, cotangent, secant, and cosecant are the fundamental trigonometric functions.

Given the triangle DEF

and ∠E = π/6

converting the radian to the degree,

for conversion put π = 180°

π/6 = 180/6

π/6 = 30°

to find sin(π/6)

sin(π/6) = sin30 = 1/2

sin(π/6) = 0.50

Hence value for the condition is 0.50.

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This is the answer hope you understand it

Therefore , the solution of the given problem of speed comes out to be the average distance travelled is  225 meters.

We can determine how fast that anything is traveling by looking at it from a distance. The amount of distance an object can go in a given length of time depends on its speed. Velocity is calculated using the formula velocity = distance/time. The three most used units of speed are meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph) (mph).

Here,

Given :

Time =  40 seconds.

To find the distance:

We use speed and time formula

=> distance = speed * time

=> distance = 15 * 30

=> distance =  225 meters.

Therefore , the solution of the given problem of speed comes out to be the average distance travelled is  225 meters.

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Answer: Undefined

Step-by-step explanation: any number divided by 0 gives no solution and therefore it is undefined, if u need more explanation then comment

Answer:

Undefined

Step-by-step explanation:

This is an experimental study, as the researcher is manipulating the independent variable (caffeine consumption) to measure the dependent variable (activity level) in a controlled environment.

This is an experimental study, as the researcher is manipulating the independent variable (caffeine consumption) to measure the dependent variable (activity level) in a controlled environment. In an experimental study, the researcher has control over the independent variable and is able to measure the results of the manipulation on the dependent variable. In this study, the researcher is measuring the activity level of the children based on their caffeine consumption, which the researcher can control. The researcher is also measuring the activity level in a controlled environment, the playground, which provides a consistent setting for the experiment. This type of study is designed to test the researcher's hypothesis and determine whether there is a relationship between caffeine consumption and activity level.

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The sum of all possible values for the common ratio is -1/2.

The formula for a convergent infinite geometric series is:  Sum  =  a / (1 - r)

where a = first term and r = common ratio.

Given that,

The first term = -3/2  =>   a = -3/2

Since it sums to twice the common ratio,  Sum = 2r.

Putting these together   --->   2r  =  (-3/2) / (1 - r)                      

multiplying both sides by 1 - r:

2r(1 - r)  =  -3/2                              

multiplying both sides by 2:

4r(1 - r)  =  -3                                

multiplying out the left-hand side:

4r - 4r2  =  -3                                  

rearranging the terms:

0  =  4r2 - 4r - 3                              

factor:

0  =  (2r - 3)(2r + 1)

Either  r = 3/2  or  r = -1/2

Since an infinite geometric series converges only when  -1 < r < r,  the possible answer 3/2 must be rejected.

Thus, r = -1/2

Therefore, the sum of all possible values for the common ratio is -1/2.

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The coordinates of the points C and D are:

C = (1, -2), D = (-1, -2).

What is cartesian coordinate system?

A Cartesian coordinate system in a plane is a system of coordinates that uniquely identifies each point by a pair of numerical coordinates. These numerical coordinates are the signed distances from two fixed perpendicular oriented lines to the point, measured in the same unit of length.

Given:

The coordinates of A and B are A(1, 3) and b(-1, 3).

We have to find the coordinates of point C and D.

We know that C and D are directly below A and B respectively. So the x-values must coincide.

Then we can say that:

C = (1, y)

D = (-1, y)

Now, remember that for a rectangle of length L and width W the area is:

A = W*L

In this case, the length is AB, then:

L = 1 - (-1) = 2

And the area is 10 square units, so:

10 = W*2

10/2 = W = 5

This means that:

AC = BD = 5

So the difference between the y-component of A and the y-component of C is 5 units

3 - y = 5

3 - 5 = y = -2

Hence,  the coordinates of the points C and D are:

C = (1, -2), D = (-1, -2)

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By taking a difference, we will see that you can save $4.70 if you buy the pack.

To find the savings, we need to take the difference between the cost of the  6 times the cost of 1 bookshelf, and the cost of the 6 bookshelves.

The cost of 1 bookshelf is $14.95, and the cost of 6 together is $85.00, then the savings is given by:

S = 6*$14.95 - $85.00

S = $89.70 - $85.00

S = $4.70

You save $4.70 in total if you buy the pack.

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The solution to the system of equations for this problem is given as follows:

(x, 3x - 27).

The system of equations for this problem is defined by these two equations presented as follows:

The first equation can be simplified as follows:

y = 3x - 27 = 3(x - 9).

Hence, substituting y = 3(x - 9) into the second equation, the solution for x can be obtained as follows:

x - 3(x - 9)/3 = 9.

x - x + 9 = 9

0x = 0.

As the system has the format 0x = 0, and considering that the division of 0 by 0 can assume any result different of zero, the system has an infinite number of solutions, in the following format:

(x, 3x - 27).

Meaning that the independent variable x is the free variable and the dependent variable y depends on the value of x.

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The value of y in the parallelogram is 120^o.

A parallelogram is a plane figure which has opposite sides to be equal. Some of its properties are:

i. Opposite sides are equal in length

ii. It has two diagonals

iii. Sum of adjacent angles is 180^o

The value of y in the diagram can be determined as;

m<ADC + m<DCB = 180^o              (sum of adjacent angles is 180^o)

(x + 8) + 3x = 180

4x = 180 - 8

    = 172

x = 172/ 4

  = 43

x = 43^o

So that;

m<ADC = x + 8

             = 43 + 8

             = 51^o

Therefore,

m<ADC + m<DAB = 180^o

51^o + (y + 9) = 180^o

y + 60 = 180

y = 180 - 60

 = 120

y = 120^o

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The price to tile the room is $3,240.

We must figure out how many tiles are required to cover the floor before multiplying that number by the cost per tile to get the cost of tiling the room.

To begin, we must change the room's measurements from meters to centimeters in order to make them consistent with the tile's size. Multiplying 9 by 100 and 7.5 by 100 will yield the results we need: 9m x 100cm/m = 900cm, and 7.5m x 100cm/m = 750cm

Since the room and tile dimensions are now both expressed in centimeters, we can calculate the number of tiles required to cover the space by dividing its size by the tile's area:

25 cm × 20 cm / 36000 cm / 500 cm = (900 cm x 750 cm) / 72

In order to cover the room, 72 tiles are required. We must multiply the quantity of tiles by the price per tile in order to determine the cost:

72 tiles x 45 cents each tile = 3,240

Therefore, the price to tile the room is $3,240.

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The length of the arc intercepted by the central angle of 240 degrees on a circle with a radius of 16 inches would be 67 inches (rounded to two decimal places)

To find the length of an arc on a circle intercepted by a central angle, we can use the formula: arc length = (θ / 360) * (2 * π * r)

where θ is the measure of the central angle in degrees, π is approximately 3.14, and r is the radius of the circle.

In this case, we are given a circle with a radius 16 inches and a central angle of 240 degrees. Plugging these values into the formula, we get:

arc length = (240 / 360) * (2 * 3.14 * 16) = (2/3) * 100.48 = 67 inches

So the length of the arc intercepted by the central angle of 240 degrees on a circle with a radius of 16 inches would be 67 inches (rounded to two decimal places)

Therefore, the length of the arc would be 67 inches.

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Yes, the ordered pairs (child number, amount paid) represent a function.

A function is a relationship between inputs where each input is related to exactly one output.

Example:

f(x) = 2x + 1

f(1) = 2 + 1 = 3

f(2) = 2 x 2 + 1 = 4 + 1 = 5

The outputs of the functions are 3 and 5

The inputs of the function are 1 and 2.

We have,

Number of children = 20

Cost per children = $2

Now,

The ordered pairs are:

(1, 2), (2, 4), (3, 6), (4, 8), (5, 10), (6, 12), (7, 14), (8, 16), (9, 18), (10, 20),

(11, 22), (12, 24), (13, 26), (14, 28), (15, 30), (16, 32), (17, 34), (18, 36), (19, 38), (20, 40)

The ordered pairs are a function.

A function can be one-to-one or many-to-one but not one-to-many.

We see that the ordered pairs are one-to-one.

Thus,

The ordered pairs are functions.

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This study is an example of an experimental study. The controlled factor is the group of patients.

The collection of data is gathered and chosen from a statistical population with the use of some prescribed techniques in both statistics and quantitative methodology. Data sets may be divided into two categories: sample and population.

All the components of the data set are included in the population, which also contains quantifiable qualities like mean and standard deviation.

A sample is made up of one or more observations that are taken from the population, and a statistic is what makes a sample quantifiable. The act of sampling is the selection of a sample from a population.

Complete question:

In a research study to test a new drug on patients with brain cancer, patients were divided into 2 groups randomly. One group received the drug and the other group did not receive the drug. After 6 weeks, the measured results showed reduction in symptoms among the first group who received the drug. Is this an example of an observational study or experimental study? If it is an experiment, what is the controlled factor?

Select the correct answer below:

The study is an observational study.

The study is an experiment.

The controlled factor is the symptoms of the disease.

The controlled factor is the group of patients.

The controlled factor is the type of drug given to each group.

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8 laps time 1/4 mile is 2 miles .

Average speed in miles per hour:

2 mi / 12.5 min * 60 min/hour = 9.6 mph

Average velocity is zero, since velocity is directional and the person jogged around a track. [I mention that in case this was set up as a trick question.]

But if we're really looking for average speed in m/s we can easily convert:

A mile is about 1.6 km, so it's about 1600 m.

(2 mi * 1600 m/mi) / (12.5 min * 60 s/min) = 1800 / 750 = 2.4 m/s

The directional speed of an item in motion, as measured by a specific unit of time and observed from a certain point of reference, is what is referred to as velocity.

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a. To prove the product property for logarithms using a base of 3 and solutions of 3, 9, 27, 81, and 243, we can start with the equation: log3(xy) = log3x + log3y

Let's say we want to find log3(81 * 27)
We know that log3(81) = 4, and log3(27) = 3
So, log3(81 * 27) = log3(81) + log3(27) = 4 + 3 = 7

We can verify this by using the fact that we know the solution of log3(81*27) is 243, and 3^7 = 243.

b. To prove the quotient property for logarithms using a base of 3 and solutions of 3, 9, 27, 81, and 243, we can start with the equation: log3(x/y) = log3x - log3y

Let's say we want to find log3(81 / 27)
We know that log3(81) = 4, and log3(27) = 3
So, log3(81 / 27) = log3(81) - log3(27) = 4 - 3 = 1

We can verify this by using the fact that we know the solution of log3(81/27) is 9, and 3^1 = 9.

c. To prove the power property for logarithms using a base of 3 and solutions of 3, 9, 27, 81, and 243, we can start with the equation: log3(x^n) = n*log3x

Let's say we want to find log3(81^3)
We know that log3(81) = 4
So, log3(81^3) = 3 * log3(81) = 3 * 4 = 12

We can verify this by using the fact that we know the solution of log3(81^3) is 243, and 3^12 = 243.

In all the above examples, we can see that the properties are upheld, and we can use the log3(y) values of 3, 9, 27, 81, and 243 to prove the Product, Quotient and Power property of logarithms with base 3.

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The required number of tiles required is 100

as per detail stated above,

the length of the side of the square tile is (s) = 5m

the length of the side of the square pavement (S) is 50m

the area of square tile whose side length is 5 m is

area = side (s) times side (s)

area = 5 x 5

area = 25

now the second area

the area of the square pavement whose side length is 50m is

area = side (s) times side (s)

area = 50 x 50

area = 2500[tex]m^2[/tex]

now to find

the required number of tiles  = area of the square pavement by the area of the square tile

therefore

the required number of tiles are =

=> 2500/25

=> 100

therefore the required number of tiles are 100.

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