Adding and subtracting decimals word problems

Answer:

Step-by-step explanation: 62 is the limit

Based on the graph, a solution for the system of inequalities is 70 and 30.

In order to write a system of linear inequalities to describe this situation, we would assign variables to the number of 2 pounds tickets sold and number of 3 pounds tickets sold, and then translate the word problem into algebraic equation as follows:

Since less than 100 people attend an exhibition, we have;

x + y < 100           ..........equation 1.

Additionally, more than €260 is raised with tickets of €2 and €4;

2x + 4y > 260         ..........equation 2.

Next, we would use an online graphing calculator to graphically solve the system of linear inequalities. Hence, the required solution for the given system of linear inequalities is the point of intersection of the two (2) lines on the graph, which is given by the ordered pair (70, 30)

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Complete Question:

Less than 100 people attend an exhibition and more than €260 is raised with tickets of €2 and €4. How many tickets of each type could have been sold?

Red to tiny will have a probability of 12/20.

Describe probability.

In other terms, probability is a number that indicates the likelihood of an event occurring. Probability is defined as the ratio of favorable outcomes to all outcomes.

Probability is calculated as follows: N = N samples / N favorable outcomes

There are 20 blue numbers, of which the large ones are 17 and the small ones 3. Likewise, there are 20 red digits; the large ones are 8 and the small ones are 12.

The likelihood of receiving a little red number will be determined as follows:

Probability is calculated as follows: N = N samples / N favorable outcomes

12 good outcomes total.

There are 20 samples total.

Fill out the formula above with the value.

12/20 is the probability.

As a result, 12/20 will be the likelihood of red to little.

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V = 1/3πr²h

•Mutiply both sides by 3 to cancel out the fraction

3V = πr²h

•Divide both sides by πh 3V/πh = r²

•Find the square root of both sides

√3V/πh = r

•Switch the sides to make it easier to read

r = √3V/πh

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The point that represents a solution to the linear equation 5x + 6y = -15 is (-1, -5 / 3)

Linear equation can be represented in different form such as standard form, general form, slope intercept form and point slope form.

Therefore, let's find the solution to the linear equation.

5x + 6y = -15

Let's put the equation in slope intercept form.

5x + 6y = -15

6y = -5x - 15

divide through by 6

y = - 5 / 6 x - 15 / 6

y = - 5 / 6 x - 5 / 2

Therefore, the slope of the equation is -5 / 6 and the y-intercept is - 5 / 2.

Using the equation we can find the solution of the equation.

We will substitute the value of x to get y value.

Hence,

y = - 5 / 6 x - 5 / 2

using (-1, -5 / 3)

y = - 5 / 6 (-1) - 5  /2

y = 5 / 6 - 5 / 2

y = - 5 / 3

Hence, the solution is (-1, -5 / 3)

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Answer:

  a) 81/500

  b) 7/90

  c) 3/11

Step-by-step explanation:

You want to write the fractions that correspond with the decimals ...

  a) 0.162

  b) 0.0777...

  c) 0.272727...

The fraction corresponding to a terminating decimal can be written based on how you pronounce the fraction.

  0.162 = "one hundred sixty-two thousandths" = 162/1000

This can be reduced by removing a common factor of 2.

  = 81/500

The fraction equivalent to a repeating decimal can be found by a multiply and subtract process. In general, this makes the denominator be a number that has as many 9s as the decimal has repeating digits.

This has one repeating digit, 7. This means we want to convert to a fraction by multiplying by 10 to the power of 1:

  x = 0.0777...

  10x = 0.7777...

Now, we can subtract the original number:

  10x -x = 0.7777... -0.0777... = 0.7000...

Notice that the repeating digits cancel. Now we have ...

  9x = 0.7 = 7/10

Dividing by 9 gives ...

  x = 7/90

Using the above method with 10 to the power of 2 (with a 2-digit repeat), we get ...

  100x = 27.272727...

  100x -x = 27.272727... -0.272727... = 27

  99x = 27

  x = 27/99 = 3/11

__

Additional comment

In general, the repeating part of a repeating decimal can be expressed over an equivalent number of 9s. For example, the 6-digit repeat 0.142857142857... is equivalent to 142857/999999. As it happens, this one reduces to 1/7.

If there are intervening digits, as in 0.4333... for example, then they can be treated as a terminating decimal, and the repeating part can be multiplied by an appropriate power of 10 to account for the shift from the decimal point:

  0.4333... = 0.4 + 0.1 × 0.333...

  = 4/10 + 1/10 × 3/9 = 4/10 + 1/30

  = 12/30 +1/30 = 13/30

No, it does not make sense that the probability of cats falling from the 5th floor would be greater than those of the 4th. The force of gravity is the same regardless of the floor, so the number of cats falling should be the same no matter what floor they start from.

The force of gravity is a constant force that is the same on all floors. This means that the same amount of force is acting on the cats, no matter which floor they start from. Therefore, the number of cats falling from the 5th floor should be the same as the number falling from the 4th floor. The number of cats falling from a higher floor may be greater if there are extra factors, such as wind, that could affect their fall, but the force of gravity does not change with the floor. Therefore, it does not make sense for the number of cats falling from the 5th floor to be greater than those of the 4th

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Answer: 1/4

Step-by-step explanation:

Answer:

1/4

Step-by-step explanation:

We know that 25% is equal to the decimal 0.25. So, we can convert the decimal into a fraction

To do so, we need to write the fraction 0.25 x 100 / 100.

Solving the top part (100 x 0.25), we get 25/100.

Next, we need to simplify this fraction. The GCF (greatest common factor) of both numbers is 25, so we divide 25 by 25 and 100 by 25.

This leaves us with 1/4, and our answer.

The minimum number of unbroken briquets the bag would have to contain for the company to avoid having to replace the bag for free is b) 411.

A standard deviation (or σ) is a degree of the way dispersed the records is with regards to the mean. Low standard deviation approach records are clustered across the mean, and excessive widespread deviation suggests records are greater unfold out. The interval of filled bags is at confidence interval of 95%. At 95% confidence interval, Z=1.96 (from Z tables).But, Z= (x-mean)/SD => 1.96 = (x-450)/20 => x (upper limit)= 20*1.96+450489 bags. Lower limit or minimum number bags to avoid replace= 450-1.96*20 =411 bags.

Therefore, the correct option is b.

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The antiderivative of f(x) = tan⁻¹(x) is x tan⁻¹(x) − ln(x²+1)/2 + C

The term antiderivative in math is referred as a function that reverses what the derivative does

Here we have given the expression f(x) = tan⁻¹(x).

Now, the antiderivative of the expression is calculated by doing the integral

=> ∫tan⁻¹(x)dx

By using the integration by parts ∫udv = uv−∫vdu

Here let us consider that u=tan⁻¹(x) and dv=dx

And the value of du is calculated as,

=> du =  ∫tan⁻¹(x)dx =  dx/(x² + 1)

And the value of v = x.

Then the expression is written as,

=>  ∫tan⁻¹(x)dx = x tan⁻¹(x) - ∫x/(x² + 1)dx

As per the concept of the constant of integration, it can be simplified as,

=> x tan⁻¹(x) − ln(x²+1)/2 + C

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If there are no duplicate digits, then and only then, is a number considered to be unique. For instance, unique numbers include 20, 56, 9863, 145, etc., but non-unique numbers include 33, 121, 900, 1010, etc.

Any two items that are the only ones of their kind are equally unique. Unique is defined as the only one like it. There is not a singular most. Each number is distinct because there is only one other one like it. For instance, if you subtract a three-digit number, like 345, from its reverse, 543, you get a difference of 198.

If the number An'obtained is subtracted from a number An made up of n consecutive digits in ascending order by reversing the digits of An, then the difference is always a constant. This constant is termed as the Unique number Un.

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Answer:

Step-by-step explanation:

Domain is constant since there are no value that x could be to make this not a possible answer

First f(x)=3x+5 y=3x+5 then y+5=3x so (y+5)/3

inverse is (x+5)/3

Then g(x)=x^2+6 y=x^2+6 then y-6=x^2 so then x=  \sqrt{y-6}

inverse is   \sqrt{y-6}

a) The probability the home team wins is of: 0.7291 = 72.91%.

b) The conditional probability that the home team wins, given that is is behind 5 points by the end of halftime is of: 0.3409 = 34.09%.

c) The conditional probability that the home team wins, given that it is ahead by 5 points at the end of the first quarter is of: 0.9015 = 90.15%.

The z-score of a measure X of a variable that has mean symbolized by [tex]\mu[/tex] and standard deviation symbolized by [tex]\sigma[/tex] is obtained by the rule presented as follows:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The mean and the standard deviation for each quarter are given as follows:

Hence for each case, the mean and the standard deviation are given as follows:

The probability of the home team winning is the probability of X being greater than zero for four quarters, hence it is one subtracted by the p-value of Z when X = 0, hence:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

Z = (0 - 6)/9.8

Z = -0.61

Z = -0.61 has a p-value of 0.2709.

1 - 0.2709 = 0.7291 = 72.91%.

When the home team is down five points at the end of the halftime, the probability of winning is P(X > 5) for two quarters, hence one subtracted by the p-value of Z when X = 5 as follows:

Z = (5 - 3)/4.9

Z = 0.41

Z = 0.41 has a p-value of 0.6591.

Z =  has a p-value of 0.6591.

1 - 0.6591 = 0.3409 = 34.09%.

When the home team is up five points at the end of the first quarter, the probability of winning is P(X > -5) for three quarters, hence one subtracted by the p-value of Z when X = -5.

Z = (-5 - 4.5)/7.35

Z = -1.29

Z = -1.29 has a p-value of 0.0985.

1 - 0.0985 = 0.9015 = 90.15%.

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In a list or collection of numbers, the range is the difference between the lowest and highest integers. Place all the numbers in order before attempting to determine the range.

The statistics' range is the difference between the highest and lowest values for a specific data collection. The range could also be expressed as the difference between the highest and lowest observation. The sample interval is calculated as the greatest value less the smallest value. The sample range is a crucial measure of variability for continuous variables.

here

The x values for a function like f are contained in this collection (x).

The collection of numbers that the function assumes is known as its range.

Following the insertion of an x value, the function outputs this sequence of values.

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When constructing an angle bisector, the compass should be used to make three arcs, but these arcs do not necessarily need to have the same radius.

To construct an angle bisector, you can follow these steps:

In step 1, the radius of the first arc can be any length, as long as it intersects both sides of the angle. The radius of the second and third arcs should be the same as the first arc because they are drawn using the same width setting on the compass. However, the radius of the second and third arcs does not need to be the same as the radius of the first arc. The important thing is that all three arcs are drawn using the same width setting on the compass so that they are all equidistant from the vertex of the angle.

The complete question is:-

When constructing an angle bisector, the compass must be used to make three arcs. Do all three arcs need to have the same radius? Explain.

- Yes, because then the marks are equidistant from each other.

- Yes, because you need the points of intersection of the angle and arcs to form a parallelogram.

- No; the second two arcs must have the same radius but it can be different from the first.

- No; any three radii will work.

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a. Yes Juan is correct.

b. The given quadratic equation can be solve by using quadratic formula.

What is a quadratic equation?

A quadratic equation is a polynomial equation with a maximum degree of two. Where a ≠ 0, the equation is given by ax² + bx + c = 0.

Given equation is x² + 7x + 3.

The given equation can't factorized by using middle term or splitting method.

Factorization of quadratic equations can be done in different methods. They are:

Splitting the middle term

Using formula

Using Quadratic formula

Using algebraic identities

Assume that x² + 7x + 3 = 0

x = [-7 ± √(7² - 4 × 1 × 3)]/ 2 × 1

x = [-7 ± √37]/ 2

The factors of quadratic polynomial is ( x - [-7 ± √37]/ 2).

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The triangle has sides of 12, 36, and 37 and is not a right triangle.

What are Pythagoras's triples of the right triangle?

Pythagorean triples are defined as a² + b² = c², where a, b, and c are positive integers. These triples are denoted as (a,b,c). The perpendicular is a the base is b, and the hypotenuse is c of a right-angled triangle.

We have,

a triangle has sides of 12, 36, 37

A Pythagorean triple consists of three positive integers a, b, and c, such that a² + b² = c². Such a triple is commonly written (a, b, c), and a well-known example is (3, 4, 5). If (a, b, c) is a Pythagorean triple, then so is (ka, kb, kc) for any positive integer k.

(12)² + (36)² = (37)²

1440 = 1369

S0, LHS ≠ RHS

Hence, the triangle has sides of 12, 36, and 37 is not a right triangle.

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Therefore , the algebra is derived from Islam word  Arabic al‐jab used by its  founder.

Mathematical branch known as algebra deals with symbols and the rules governing their manipulation. These characters, which are now expressed as Latin and Greek letters, stand for variables, or quantities without set values, in elementary mathematics. Similar to how sentences illustrate the connections between particular words, in algebra,

Here,

The word algebra is derived from the Arabic word al‐jabr, which its creator, Muhammad ibn Mūsā al‐Khwārizmī, used in the title of his work.

Al-Jabr wa-l-muqbalah, which dates to the ninth century (The Science of Equations and Balancing).

Therefore , the algebra is derived from Islam word  Arabic al‐jab used by its  founder.

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The expression f (0) in a function is used to represents the y-intercept on the graph of the function f (x).

The point where the graph cuts the y - axis is known as the y - intercept whereas the point where it cuts the x - axis is known as x - axis. The graph cuts y- axis when the value of x coordinate is 0.

The values which satisfies the equation is known as the zeros of the function. The graph of a function is the set of all points in the plane of the form (x f(x)).

The graph of f could similarly be defined as the graph of the equation y = f(x). As a result, the graph of a function is a subset of the graph of an equation.

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Answer:

The answer is 35.

Step-by-step explanation:

The given polynomial is p(x) = 5x² -4x + 2 we substitute x = 3 in the polynomial:

p(3) = 5(3)² -4(3) + 2 = 5×9 - 12 + 2 = 45 - 12 + 2 = 47 - 12 = 35

Hence, p(3) =35

The amount that Sarah need to invest for the value of the account to reach $1030 will be equal to $792.

Interest that is added to a loan and deposit sum is known as compound interest. In our everyday lives, it is the notion that is employed the most frequently.

Compound interest is calculated as a sum using the interest and principal accrued over time. Compound interest versus simple interest differ primarily in this way.

As per the details given in the question,

Rate, r = 5.3%

Time, t = 5 years

Amount = $1030

As per the formula of compound interest:

x × (1 + 5.3%/4)⁽⁵⁾⁽⁴⁾ = 1030

x × (1 + 53/4000)⁽⁵⁾⁽⁴⁾ = 1030

Now, calculate the product,

x × (1 + 53/4000)²⁰ = 1030

x × [(4000 + 53)/400]²⁰ = 1030

x = 1030/(4053/4000)²⁰

x = (1030 × 4000²⁰)/4053²⁰

x = 792.

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The rule of the reflection of the triangle ABC to A'B'C' across the y-axis will be (x, y) to (-x, y).

It is the image of the point which is located in the opposite direction of a given point.

The rule of the refection will be given as,

Firstly, the rule for reflecting a point about the y-axis is;

While reflecting on the y-axis, we get the reflected points (x, y) by the coordinates (-x, y).

The standard of the impression of the triangle ABC to A'B'C' will be (x, y) to (- x, y).

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We can see (either graphically or algebraically) that the lowest point, or minimum, occurs when x = 3 and y = −4. That is the location of the vertex.

The coordinate of the vertex is (3 , −4)

given equation

y = [tex]x^{2}[/tex] - 6x + 5

  = [tex](x - 3)^{2}[/tex] - 4

We can see (either graphically or algebraically) that the lowest point, or minimum, occurs when x = 3 and y = −4. That is the location of the vertex.

The coordinate of the vertex is (3 , −4)

quadratic function :

A quadratic function is one of the form f(x) = ax2 + bx + c, where a, b, and c are numbers with a not equal to zero.

The graph of a quadratic function is a curve called a parabola. Parabolas may open upward or downward and vary in "width" or "steepness", but they all have the same basic "U" shape. The picture below shows three graphs, and they are all parabolas.

All parabolas are symmetric with respect to a line called the axis of symmetry. A parabola intersects its axis of symmetry at a point called the vertex of the parabola.

You know that two points determine a line. This means that if you are given any two points in the plane, then there is one and only one line that contains both points. A similar statement can be made about points and quadratic functions.

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Get the two triangles to face in the same direction, or in the same orientation, to check if they resemble one another.

Three sides and three vertices make up a triangle, which is a polygon. It is among the fundamental forms in geometry. Triangle ABC is a graphical representation of a triangle having vertices A, B, and C. When the three points are not collinear, a unique plane and triangle in Euclidean geometry are found. A triangle is a three-sided polygon that is also referred to as a trine on occasion (less frequently). There are three sides and three angles in every triangle, some of which may be equal.

Get the two triangles to face in the same direction, or in the same orientation, to check if they resemble one another. You do this by twisting one form such that it is in alignment with the other. A rotation is the name given to such a change.

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Answer: false

Step-by-step explanation:

Angles can be measured using one of two standard units. Degrees are the most widely used unit of measurement.

∠ABD = 39°

Therefore, the correct option is c) 39°

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Yes, y = -3x is proportional because the ratios are equivalent, the equation is proportional.

A mathematical comparison of two numbers is called a proportion. According to proportion, two sets of provided numbers are said to be directly proportional to one another if they increase or decrease in the same ratio. '::' or '=' are used to indicate proportions. Using 2:5::4:8 as an example, 2/5 Equals 4/8 Here, the averages are 5 and 4 and the extremes are 2 and 8. A proportion is an equation that sets two ratios at the same value.

Given

y = -3x

Yes, Because the ratios are equivalent, the equation is proportional.

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The Square root function is written in the form of f(x) = √x .

The Square Root function is defined as the function in which the parent function is written in the form of f(x) = √x .

and the inverse of the Square root function is square function , f(x) = x² .

The Domain and range of the root function is [0 , ∞) .

which means the range is the set of all positive real numbers and

hence in the square root function, result is always positive.

Some Examples of Root Functions are , √2 , √3 , √8 etc.   .

Therefore , Square Root function is explained .

The given question is incomplete , the complete question is

What is the Square Root Function ?

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Answer:

[tex]m\angle DAC=35^{\circ}[/tex]

Step-by-step explanation:

Arc [tex]BC=50^{\circ}[/tex] (inscribed angle theorem)

Arc [tex]AB=130^{\circ}[/tex] (semicircle)

[tex]m\angle ADB=65^{\circ}[/tex] (inscribed angle theorem)

[tex]m\angle DEA=80^{\circ}[/tex] (linear pair)

[tex]m\angle DAC=35^{\circ}[/tex] (angle sum of a triangle)