The dimension of actual plane is 300 inches.
What are ratios?
A ratio is the comparison of quantities which have same parameters or units of measurement.
Why are calculation of ratios significant?
It helps to identify how big or small a quantity is as compared to other thing having same parameter of measurement.
NOTE: Things which have different measurement cannot be compared by ratio;
Example: 1 litre of milk cannot be in ratio with 1 kg of sand, as milk is measured in volume and sand is in weight.
Solution:
Given, ratio of model of plane and actual plane = 1 : 40
x = 7.5 inches
Let, x be the dimension of model of the airplane
y be the dimension of actual airplane
Using the formula by equating the ratios,
1/40 = x/y
⇒ 1 x y = 40x
⇒ y = 40 x 7.5
⇒ y = 300 inches
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Show that x(x - 1)(x + 1) = x³ - x
x (x - 1) (x + 1) = [tex]x^{3}[/tex]- x
Distribute
1. (x + 1) [tex]x^{2}[/tex] - x (x + 1) = [tex]x^{3}[/tex] - x
2. Distribute
(x + 1) [tex]x^{2}[/tex] - x (x + 1) = [tex]x^{3}[/tex] - x
[tex]x^{3 }[/tex] + 1 [tex]x^{2}[/tex] - x (x + 1) = [tex]x^{3 }[/tex] - x
3. Multiply by 1
[tex]x^{3 }[/tex] + 1 [tex]x^{2}[/tex] - x (x + 1) = [tex]x^{3 }[/tex] - x
[tex]x^{3 }[/tex] + [tex]x^{2}[/tex] - x (x + 1) = [tex]x^{3 }[/tex] - x
4. Distribute
[tex]x^{3 }[/tex] + [tex]x^{2}[/tex] - x (x + 1) = [tex]x^{3 }[/tex] - x
[tex]x^{3 }[/tex] + [tex]x^{2}[/tex] - ([tex]x^{2}[/tex] + x) = [tex]x^{3 }[/tex] - x
5. Distribute
[tex]x^{3 }[/tex] + [tex]x^{2}[/tex] - ([tex]x^{2}[/tex] + x) = [tex]x^{3 }[/tex] - x
[tex]x^{3 }[/tex] + [tex]x^{2}[/tex] - [tex]x^{2}[/tex] - x = [tex]x^{3 }[/tex] - x
6. Combine like terms
[tex]x^{3 }[/tex] + [tex]x^{2}[/tex] - [tex]x^{2}[/tex] - x = [tex]x^{3 }[/tex]- x
[tex]x^{3 }[/tex] - x = [tex]x^{3 }[/tex] - x
7. Move terms to the left side
[tex]x^{3 }[/tex] - x = [tex]x^{3 }[/tex] - x
[tex]x^{3 }[/tex] - x - ([tex]x^{3 }[/tex] - x) = 0
8. Distribute
[tex]x^{3 }[/tex] - x - ([tex]x^{3 }[/tex] - x) = 0
[tex]x^{3 }[/tex] - x - [tex]x^{3 }[/tex] + x = 0
9. Combine like terms
[tex]x^{3 }[/tex] - x - [tex]x^{3 }[/tex] + x = 0
- x + x = 0
10. Combine like terms
- x + x = 0
0 = 0
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What is the exact value of x?
5·215x=16
Answer:
X=log 3.2/5 log 21
Step-by-step explanation:
X=0.0764094
A triangle has two sides of length 8.3 and 3.4. What compound inequality describes the possible lengths for the third side, x?
Using Pythagoras theorem the compound inequality for the possible length is 7.6 ≤ x ≤ 9
Pythagoras TheoremPythagoras theorem states that “In a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the other two sides“. The sides of this triangle have been named Perpendicular, Base and Hypotenuse. Here, the hypotenuse is the longest side, as it is opposite to the angle 90°.
To find the possible value for the third side, we have to use Pythagoras formula which is given as;
x² = y² + z²
In the first scenario, we would assume the third side is the hypothenuse
x² = 8.3² + 3.4²
x = 9
In the second scenario, we would assume the third side is one of the legs of the triangle and the formula will change to
8.3² = y² + 3.4²
y² = 8.3² - 3.4²
y = 7.6
Writing a compound inequality to show the possible length
7.6 ≤ x ≤ 9
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a farmer wishes to enclose two identical adjoining rectangular pens against the side of a large barn. she wants each pen to have an area of 750 square feet and will use the barn as one side of the enclosure. what is the least amount of fencing needed (in feet) to create the two pens?
Using basic geometry and area formula for calculation of length, Apply fencing on only 3 side , The answer is 109.54 feet.
What do you mean by geometry?A subfield of mathematics called geometry examines the dimensions, placements, angles, and sizes of objects.
What is a rectangle and it's formula for area?A plane shape, as opposed to a square, with four straight sides and four right angles, particularly one with uneven neighboring sides.
Area of rectangle is:
A= l x b
area=750 square feet.
for attaining minimum area , these area must be fitted in square,
so, [tex]l = \sqrt {750}[/tex]
=27.38 feet
since, one side is taken by barn, l should be extended 4 times, 2 on 1 side and 2 on sides each.
Total length of fence = 4 * 27.38
= 109.54 feet
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State all integer values of x in the interval 1 ≤ x ≤ 8 that satisfy the following
inequality:
5x − 8 > 6
Answer:
3,4,5,6,7.
Step-by-step explanation:
if yk, yk
When the sun is at a certain angle in the sky, a 50-foot building will cast a 20-foot shadow. What is the length of the shadow in feet cast by a 20-foot pole at the same time? Enter only the number.
Using the concept of proportions, the 20 feet pole will cast an 8ft shadow
ProportionsProportion is a mathematical comparison between two numbers. According to proportion, if two sets of given numbers are increasing or decreasing in the same ratio, then the ratios are said to be directly proportional to each other.
In this problem, we can find the length of the shadow casted if we write a proportional relationship between the two object.
50 / 20 = 20 / x
Cross multiply both sides and solve for x
50 × x = 20 × 20
50x = 400
x = 400 / 50
x = 8
The shadow is 8ft
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Which equations are continuous?
Any equation that does not contain a discontinuity, defined as a point where the graph of the equation has a sudden break or jump, is considered continuous. Examples of continuous equations include linear equations, polynomial equations, and exponential equations.
Continuity is an important concept in mathematics and related disciplines. A continuous equation is defined as any equation that does not contain a discontinuity, which is a point where the graph of the equation has a sudden break or jump. Discontinuous equations are equations with discontinuities that cause the graph of the equation to have sudden jumps or breaks. Linear equations, polynomial equations, and exponential equations are all examples of continuous equations, since they do not contain any discontinuities. Continuous equations are important because they are used in many areas of mathematics, such as calculus, to solve problems and understand the behavior of certain function
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Last summer, Sheila decided to measure change in a swimming pool's
water level each week. There was a hot and dry spell that lasted 4
weeks and the water level dropped the following amounts each week
Sheila measured the level: 8 millimeters in the first week, 5 millimeters
in the second week, 12 millimeters in the third week, and 5 millimeters
in the fourth week. Express the total gain/loss of water over the 4
weeks as an integer
Sheila measured the water level in the swimming pool every week for 4 weeks and found that the water level decreased by 8 millimeters in the first week, 5 millimeters in the second week, 12 millimeters in the third week and 5 millimeters in the fourth week. The net result was a loss of 10 millimeters of water over the 4 week period.
Sheila wanted to track the changes in the water level of a swimming pool over time. She measured the level every week for 4 weeks. In the first week, the water level dropped by 8 millimeters. In the second week, the level dropped by 5 millimeters. In the third week, the level dropped by 12 millimeters. Finally, in the fourth week, the level dropped by 5 millimeters. The net result of these measurements was a loss of 10 millimeters of water over the course of the 4 week period. This indicates that the hot and dry spell had a negative effect on the water level in the pool.
Total Water Loss = 8 millimeters + 5 millimeters + 12 millimeters + 5 millimeters = 30 millimeters
Total Water Gain = 0 millimeters
Net Loss = Total Water Loss - Total Water Gain = 30 millimeters - 0 millimeters = -10 millimeters
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Are all equilateral triangles similar and congruent?
All equilateral triangles are similar.
In an equilateral triangle, all the lengths of the sides are equal.
In such a case, each of the interior angles will have a measure of 60°
Since the angles of an equilateral triangle are the same, it is also known as an equiangular triangle.
A property of equilateral triangles includes that all of their angles are equal to 60°
The AAA Triangle Similarity Postulate asserts that if all of the angles in a triangle are equal to the corresponding angles in another triangle, then those two triangles are equal.
Since every equilateral triangle’s angles are, 60°every equilateral triangle is similar to one another due to this AAA Postulate.
=> For congruence of triangles, we need equal sides for two equilateral triangles, but here it has said nothing about sides of both triangles in Congruent. So, this is incorrect. Here, it can be said that all equilateral triangles are similar.
Hence, all equilateral triangles are similar.
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Given: ABCD is a parallelogram; line FD is congruent to line BE
Prove: Line A F is congruent to line EC
From the parallelogram AECF, lines A F is similar to E C.
How to determine congruent lines?You should know that two or three lines are congruent if they are the same or if they look alike.
The given parameters are
Parallelogram A E CF (given)
Parallelogram A B C D given
In every parallelogram, opposite side are parallel and similar
From parallelogram ABCD, line AB = DC = FD
Also, AB=DC=BE
In the figure also, ΔAFD=ΔBCE (similar triangles)
Therefore, A F similar to E C
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What is rational root theorem give one example?
The rational root theorem is the required to represents rational root or zeros or the solution of the given polynomial function with example: g(x) = 4x² - 4x + 1.
As given in the question,
Rational root theorem is also called rational zero or the solution theorem.let us take a polynomial function g(x) = b₀ + b₁x + b₂x² + ...+ bₙxⁿRational root or the solution can be derived in the simplest form x/y by using the following formula:r / s = ( One of the prime factor of b₀ ) / ( One of the prime factor of bₙ )The value of r/s is always a representation of a prime number. rational root theorem is known by different names such as root, zeros or the solution of polynomial function.Example of rational root theorem is : consider g(x) = 4x² - 4x + 1.Here b₀ = 1 , bₙ = 4 and prime factor of 4 is 2 then r/s = 1/2 is one of the factor or zero or root.Therefore, the rational root theorem is the required to find the rational root or the solution or the zero of the polynomial function.
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at a local fair, a smartphone company hosted a booth and brought several models of its phones for customers to play with and look at up close. customers were then encouraged to fill out comment cards letting the company know which of the models was their favorite. at the end of the fair, the company would randomly select a card and the owner of that card would win the smartphone of his or her choice. this is an example of
The given content is an example of sweepstakes.
What is a sweepstake?
A sweepstake is a type of contest in which a prize or prizes are given to the winner or winners. Sweepstakes began as a type of lottery tied to the sale of a product. Sweepstakes became strictly "No purchase necessary to enter or win" and "A purchase will not increase your chances of winning" under these laws, especially because many sweepstakes companies skirted the law by stating only "no purchase necessary to enter," removing the consideration (one of the three legally required elements of gambling) to prevent sweepstakes abuse.
Based on the above definition,
we can conclude that the given question is an example of a sweepstake.
Hence, this is an example of sweepstakes.
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How do you solve for y in a triangle?
Either Pythagorean Theorem or the Law of Cosines is used to solve for y in a triangle, you can use either of these equations.
The Pythagorean Theorem states that the sum of the squares of the two shorter sides of the triangle is equal to the square of the longest side. This is written as:
a2 + b2 = c2,
where a and b are the lengths of the two shorter sides, and c is the length of the longest side. In this equation, y is the length of the longest side.
The Law of Cosines states that:
a2 = b2 + c2 - 2bc cos A
where A is the angle opposite side a. In this equation, y is side a.
Therefore, to solve for y in a triangle, you can use either the Pythagorean Theorem or the Law of Cosines, depending on the information given.
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Which has a vertex at (-2,-3)?
A) y = x² + 4x+1
B) y = x² + 4x - 1
C) y = x² - 4x + 1
D) y = x² - 4x-1
Is 1 and 2 a square number?
According to square numbers , 1 is a square number while 2 is not .
What does Squaring mean ?
In mathematics, a square is the result of multiplying a number by itself. The verb "to square" is used to denote this operation. Squaring is the same as raising to the power 2, and is denoted by a superscript 2; for instance, the square of 3 may be written as 32, which is the number 9.
When you multiply an integer (a “whole” number, positive, negative or zero) times itself, the resulting product is called a square number, or a perfect square or simply “a square.” So, 0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, and so on, are all square numbers.
Thus , 1 is a square number while 2 is not .
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what factors predict how much money a film will earn? a data scientist at a top movie studio fits a multiple regression model to predict domestic gross earnings ($ millions) from: the film budget ($ millions), the film run time (minutes) average rotten tomatoes rating score [0, 100] gross
Therefore, the solution to this problem is the option 3) Gross =$204.1 million is the correct option.
What is regression model ?Regression analysis, which is used in statistical modeling, is a collection of statistical procedures for determining the associations between a dependent variable and one or more independent variables.
Here,
Given: Multiple regression model to predict domestic gross earning.
=> Gross = -27 + (1.1*Budget)-(0.43*runtime)+(2.6*return) + error
We have,
budget = $75 million
runtime = 120 minute
rotten tomatoes =77
=>Gross = -27 + (1.1*75)-(0.43*120)+(2.6*77)
=> Gross =$204.1 million
Therefore, the option 3) Gross =$204.1 million is the correct option.
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A game is played by randomly throwing a dart at the hexagon. If it lands on the dotted sector the player wins $60. Otherwise, the player loses $10. What is the value of the game?
The value of the game would be 13.33 dollars.
What is probability?
The area of mathematics known as probability deals with numerical representations of the likelihood that an event will occur or that a proposition is true. An event's probability is a number between 0 and 1, where, roughly speaking, 0 denotes the event's impossibility and 1 denotes certainty.
Value of the game = E(x)
[tex]= [(60\times\frac{5}{6}) + (-10\times\frac{1}{6})]\\\\=50 -1.66\\\\= 48.33[/tex]
P(Plain surface) = 2/6 and
P(Not plain surface) = 1 - 2/6 = 2/3
Let x: Value won/lost in the game
Value of the game
[tex]= [(60\times\frac{2}{6}) + (-10\times\frac{2}{3})]\\\\=20 -6.66\\\\= 13.33[/tex]
Hence, the value of the game would be 13.33 dollars.
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What is the discriminant of 2x² 5x 3 0?
The discriminant of a quadratic equation is equal to the expression (b^2 - 4ac) where a, b, and c are the coefficients of the equation. In this case, the discriminant is equal to (5^2 - 4(2)(3)) = 25 - 24 = 1.
The discriminant of a quadratic equation is a numerical value that can be used to determine the nature of its roots. The discriminant is equal to the expression (b^2 - 4ac) where a, b, and c are the coefficients of the equation. In this case, the equation is 2x² 5x 3 0. We can identify the coefficients of the equation as a = 2, b = 5, and c = 3. Using the formula, the discriminant is equal to (5^2 - 4(2)(3)) = 25 - 24 = 1. This means that the equation has two real and equal roots, as the discriminant is equal to zero. This can be seen by factoring the equation, which gives us (2x - 3)(x + 1) = 0. The roots of the equation are then x = 3/2 and x = -1.
Discriminant = b^2 - 4ac
= (5)^2 - 4(2)(3)
= 25 - 24
= 1
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What is the value of K if X 1 is a factor of 4x³ 3x² 4x K?
The value of k is -3, if x-1 is a factor of 4x³+3x² −4x + k
Quadratic Equation:
A quadratic equation is a second-order algebraic equation in x. The quadratic equation in standard form is ax2 + bx + c = 0. where a and b are the coefficients, x is the variable, and c is the constant term. The first condition of the quadratic equation is that the coefficients of x² are non-zero terms (a ≠ 0). To write a quadratic equation in standard form, first write the x² term, then the x term, and finally the constant term. The numbers for a, b, and c are generally written as whole numbers, not as fractions or decimals.
According to the Question:
Let P(x) = 4x³+3x² −4x + k
Given, (x−1) is a factor of P(x)
x−1 = 0
x= 1
∴ p(1) = 4×(1)³+3×(1)² −4×(1)+k = 0
⇒ 4+3−4+k = 0
⇒ k+3=0
⇒ k=−3
Hence, the value of k is −3.
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What value of b will cause the system to have an infinite number of solutions 6 3 3 6?
The value of b when the system has an infinite number of solutions is 12.
The Given equations are
y=6x-b ---(1)
6=3x+3y ----(2)
If the system has an infinite number of solutions, then equation 1 is equal to equation 2
If a pair of linear equations have unique or infinite solutions, then the system of equation is said to be a consistent pair of linear equations
Isolate variable y in equation 2
2=x+y
Multiply by 6 on both sides
y=6x-12 -----(3)
To find the value of b, equate equation 1 and equation 3
6x-b=6x-12
b=12
Thus the value of b=12.
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A water park charges a rental fee plus $2.00 per hour for lockers. The total cost of 5 hours is $13.00. Assume the relationship is linear. Find the rate of change and the rental fee.
|3t+6| =9
A. n= -5
B. n= 1
C. n= -1 or 1
D. n= -5 or 1
Answer:
C, n= -1 or 1.
Step-by-step explanation: The bars around 3x+6 are absolute value bars (| |), meaning that whatever lies inside of them will turn positive. An example: |-9| ➡️ 9. So, since we do have the absolute value bars, multiplying 3 by -1 would not effect the equation. So therefor we could use a regular 1 or a negative one to make the equation equal to 9.
How do you prove AAS congruence rule?
The two triangles are congruent if two angles and a non-included side of one triangle are congruent with two angles and the corresponding non-included side of a second triangle. So it was proved.
The two triangles are congruent if two angles and a non-included side of one triangle are congruent with two angles and the corresponding non-included side of a second triangle.
If angle ad, side ac-df, and angle cf are present, then ABCDEF is true.
To support: By the angle sum property, ABC DEF A+B+C=180° ______ (1)
In DEF D+E+F=180°___________ (2) (By angle sum property)
From (1) and (2), A+B+C= D+E+F A+E+F= D+E+F
(Given B=E and C=F) A=D ____________________ (3)
Currently, in ABC and DEF A=D (from (3))
AC = DF (Given)
C=F (Give (AAS congruency)
So it was proved.
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The second term of a geometric sequence is 6 and the fifth term is 48, what is the nth term of
the sequence?
Answer:
1536
Step-by-step explanation:
Answer:
3,6,12,24,48,96,192,384,768,1536
I don't know which term you need so i mentioned all terms
How many terms are there in the expression 5xy +9yz+ 3zx 5x 4y?
What is the base area B?
The space occupied by the flat surface of a cylinder's base, also known as the base area, is quantifiable.
Given,
Base area of cylinder;
The amount of space that a flat surface at the base of a cylinder occupies is known as the base area. Since the cylinder's base is a circle, the base area of the cylinder is actually an area of a circle.
Formula for base area;
The cylinder's base area is calculated by multiplying the square of its radius by π.
Then,
"πr²" is the formula for the cylinder's base area with radius r.
That is,
Base Area of a Cylinder = (π × radius²) square units.
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Complete question is here;
What is the base area B of cylinder?
how to determine sample size needed for confidence intercal when population standard deviation not known
When the population standard deviation is not known, the sample size needed for a confidence interval can be determined using the t-distribution.
The t-distribution is used to calculate the margin of error, which is the amount of variation that is allowed in the sample results. The sample size needed for a confidence interval is determined by calculating the critical value of the t-distribution for a given level of confidence and degree of freedom. The degree of freedom is the number of independent observations in the sample minus one.
The confidence level determines the critical value of the t-distribution, which is used to calculate the margin of error. The sample size is then calculated by dividing the margin of error by the desired confidence level. This method allows us to determine the sample size needed for a confidence interval even when the population standard deviation is unknown.
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What is the difference between negative infinity and positive infinity?
Numbers approach negative infinity as they move left on the number line and positive infinity as they move right on the number line. Negative infinity is always less than any number, positive infinity is always greater than any number.
Main Difference:
There is no positive ∞ nor negative ∞.Infinity is not a number not on the number line. Do not use in arithmetic expressions. Relearn the number line.Infinity is one size, one multiplicity. It's a size that fits a lot.The size of all odd-only sets is infinite.The set of all integers evenly divided by 7 has the same size as infinity.It is the union of the sets described above and the size of the resulting set is the same size of infinity.If we remove all negative integers from this set, the size of the resulting set will be the same size as infinity.The size of the set of all integers is infinite.His five sets above are all the same size infinity.This can happen because infinity is not a number. relearn the number line.Learn more about Negative Infinity:
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PLEASE HELP!!!!!!!
Use the expression below. -4b + 8c + 12-8b-2c +6 Part A Simplify the expression. Enter your answers in the boxes. b+ C+
Answer:
Option D is correct answer
Step-by-step explanation:
-4b + 8c + 12 - 8b - 2c + 6
-4b - 8b + 8c - 2c + 12 + 6
-12b + 6c + 18
Take 6 as common
6(-2 + c + 3)
Thus, The answer is 6(-2 + c + 3)
What is the sum of roots of x2 +5 x 6 0?
The sum of roots of x2 + 5x + 6 = 0 is -5.
x2 + 5x + 6 = 0
To find the sum of roots, we need to factor the equation :
x2 + 5x + 6 = 0
x2 + 3x + 2x + 6
= 0
x(x + 3) + 2(x + 3)
= 0
(x + 3)(x + 2) = 0
x = -3, -2
Sum of Roots = -3 + (-2) = -5
x2 + 5x + 6 = 0
To find the sum of roots, we need to factorize the given equation. To do that, we can divide the equation into two parts, x2 + 3x and 2x + 6. We can factorize the first part as x(x + 3) and the second part as 2(x + 3). Then, we can multiply both parts to get the factorized equation, (x + 3)(x + 2) = 0. We can solve this equation to get the roots, x = -3 and -2. Finally, we can add both roots to get the sum of roots, -3 + (-2) = -5.
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