Final answer:
To produce opposite coefficients for x and y in the given equations, we can multiply the first equation by -3 and the second equation by 4. This allows us to eliminate the x variable and solve for y. The solution to the system of equations is x = -2 and y = 3.
Explanation:
To multiply each equation by a number that produces opposite coefficients for x or y, you need to find a number that, when multiplied by the coefficient, results in a value with the opposite sign. For example, if the coefficient is positive, you need to multiply by a negative number, and if the coefficient is negative, you need to multiply by a positive number.
In the given equations, we have:
4x + 5y = 7
3x - 2y = -12
To produce opposite coefficients for x, we can multiply the first equation by -3 and the second equation by 4. This gives us:
-12x - 15y = -21
12x - 8y = -48
Now, we can add these two new equations to eliminate the x variable:
-12x - 15y + 12x - 8y = -21 + (-48)
-23y = -69
To solve for y, we divide both sides of the equation by -23:
y = -69 / -23
y = 3
Now, we can substitute this value of y back into one of the original equations (let's use the first equation) to solve for x:
4x + 5(3) = 7
4x + 15 = 7
4x = 7 - 15
4x = -8
x = -8 / 4
x = -2
Therefore, the solution to the system of equations is x = -2 and y = 3.
The average (A) of two number,M and N, is given by the formula A=m+n/2. Find the average of the two numbers 36 and 72.
Answer: 54
Step-by-step explanation:
Average = Total/ total number
Average= 36 +72/2
= 108/2
= 54
54 is the average of the two numbers 36 and 72.
What is Statistics?Statistics is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data.
We need to find the average of the two numbers 36 and 72.
The average (A) of two number, M and N, is given by the formula A=m+n/2
Let m = 36
n=72
Now to find the average of two numbers we have to plug in these values in the formula
A=36+72/2
=108/2
=54
Hence, 54 is the average of the two numbers 36 and 72.
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How to find the sum of the squares of the roots of an equation?
Final answer:
To calculate the sum of the squares of the roots of a quadratic equation, apply Vieta's formulas to find the sum and product of the roots and use them in the identity (α + β)² - 2αβ to avoid directly solving for the roots.
Explanation:
To find the sum of the squares of the roots of an equation, especially for a quadratic equation of the form ax²+bx+c=0, we use the relationship between the coefficients and the roots provided by Vieta's formulas.
The sum of the roots, denoted as α and β, is given by -b/a, and the product of the roots is c/a. To find the sum of the squares of the roots (α² + β²), you can use the identity (α + β)² = α² + 2αβ + β², or α² + β² = (α + β)² - 2αβ.
By substituting the sum and product of the roots from Vieta's formulas, you can calculate the sum of the squares without actually solving for the roots. This approach is especially useful in equilibrium problems or other situations where you might encounter square roots or higher powers and wish to simplify calculations.
Determine the interval on which f(x) = the square root of the quantity of x plus 2 is integrable.
(−∞, 2)
[−2, ∞)
(−∞,−2) U (−2, ∞)
All reals
The interval on which f(x) is integrable is:
[-2, ∞)
Step-by-step explanation:We are given a function f(x) as:
[tex]f(x)=\sqrt{x+2}[/tex]
We know that a function is integrable over a given interval if it is continuous over a given interval.
Now, we know that the square root function is well defined if the function under the square root sign is positive.
This means here the function is well defined if:
[tex]x+2\geq 0[/tex]
i.e.
[tex]x\geq -2[/tex]
Also, the square root function is continuous over it's domain.
and hence it is integrable over it's domain.
This means that the function is integrable over:
[-2,∞)
HELPPPPP PLEASEEEEEE
Sammy has a 10-foot ladder, which he needs to climb to reach the roof of his house. the roof is 12 feet above the ground. the base of the ladder must be at least 1.5 feet from the base of the house. how far is it from the top of the ladder to the edge of the roof? draw a sketch.
use prime factorization to find gcf of 57 and 27
−3/4(x+2)=6 solve for x
Which distance is longer? 1 mile 1000 meters 10000 centimeters?
You are going to bake an over-sized sheet cake. The recipe calls for 2 cups of sugar for every 3 cups of flour. How many cups of flour are needed if you use 18 cups of sugar?
Answer:27
Step-by-step explanation:
HELP! SIMPLIFY!
simplify:
1) (m³ n⁵) (mn⁴)
------------------
m⁻³ n²
2) 6a² b³
-----------
4a
3) 5⁶ a⁶ b³
-----------
5² ab³
Sara has 16 red flowers and 24 yellow flowers. She wants to make a bouquet with the same number of each color flowers in each bouquet. How many red flowers will be in each bouquet.
What is the limit ? And how do I get the answer?
Simplify the fraction
what is 16 over 38
In this ordered pair (4,-5) which number is the ordinate
In the ordered pair (4, -5), the number -5 is the ordinate, which represents the vertical position of a point in a coordinate system.
In the ordered pair (4,-5), the number -5 is the ordinate. In a coordinate system, ordered pairs are used to define locations with two values: the x-coordinate and the y-coordinate. The first number in the pair represents the x-coordinate, which is the horizontal position, and the second number represents the y-coordinate, which is the vertical position, also known as the ordinate.
In this context, the ordinate is the position relative to the horizontal axis in a two-dimensional space. It indicates how far up or down a point lies from the horizontal (x) axis. Hence, in the ordered pair (4, -5), -5 is the ordinate. If a point is above the x-axis, its ordinate is positive; if it's below, as in this case, it's negative.
HELP ASAP!
1. Let f(p) be the average number of days a house stays on the market before being sold for price p in $1,000s. Which statement best describes the meaning of f(250)?
The house sold for $250,000.
The house stayed on the market for an average of 250 days before being sold.
This is the average number of days the house stayed on the market before being sold for $250,000.
The house sold on the market for $250,000 and stayed on the market for an average of 250 days before being sold.
2. Laura rents a movie for a flat fee of $2.00 plus an additional $0.50 for each night she keeps the movie. Choose the cost function that represents this scenario if x equals the number of nights Laura has the movie.
c(x) = 2.00x + 0.50
c(x) = 2.00 + 0.50x
c(x) = 2.50x
c(x) = (2.00 + 0.50)x
Answer:c(x)=2.00 +0.05x
Step-by-step explanation:
Find the tax on a dinette set with a cash price of $200 that has been reduced by 20% if the tax rate is 6.5%.
Irst. write an expression for the probability that both socks are bl
Given: B = {(4, 2), (4, -2), (16, 4), . . .} Is B a function and why?
Set B = {(4, 2), (4, -2), (16, 4), . . .} is not a function because it has an 'x' value (4) that corresponds to more than one 'y' value (2,-2), which contradicts the definition of a function.
Explanation:The given set B = {(4, 2), (4, -2), (16, 4), . . .} is not a function. In mathematical terms, for a set of ordered pairs to be considered a function, each input (or 'x' value) must have exactly one output (or 'y' value). However, in B, the input 4 corresponds to two different outputs: 2 and -2. This violates the definition of a function, proving that B is not a function.
It's useful to remember this as a rule: in functions, a particular x-value can only be paired with a single y-value. In contrast, in non-functions, a single x-value can be linked to multiple y-values, as demonstrated by set B.
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In a cross-country race with 35 participants , the mean finish time was 21 minutes . Which statement must be true?
A-the most common finish time was 21 minutes
B-at least one participant finished in exactly 21 minutes.
C-over half of the participants finished in less than 21 minutes.
D-if no participants finished in less than 21 minute, than everyone finished in exactly 21 minutes
Explain how you can tell without calculating whether the sum of a postitive number and a negative number will be positive, negative or zero.
a cylinder. With a diameter of 6cm and a height of 10cm. Can you help me work out the volume of this cylinder to 1 decimal place please?
Final answer:
The volume of a cylinder with a diameter of 6 cm and a height of 10 cm is 282.8 cm³, calculated using the formula V = πr²h and rounding to one decimal place.
Explanation:
To calculate the volume of a cylinder, we use the formula V = πr²h where V is the volume, r is the radius of the base, and h is the height of the cylinder. In this case, we have a cylinder with a diameter of 6 cm, which means the radius r is half of that, or 3 cm. The height h is 10 cm. So, the volume is calculated by:
V = π × (3 cm)² × 10 cm
Substituting 3.142 for π, we get:
V = 3.142 × 9 cm² × 10 cm
V = 3.142 × 90 cm³
V = 282.78 cm³
Therefore, the volume of the cylinder rounded to one decimal place is 282.8 cm³.
In the diagram shown below, ∠K=18º and ∠H=18º.
Prove KJ=13.75. Justify your steps in a paragraph proof.
The slope of the line passing through the points (0,0) and (2,3) is
Which of the following is true for the relation f(x) = 5x + 1?
Only the inverse is a function.
Only the equation is a function.
Neither the equation nor its inverse is a function.
Both the equation and its inverse are functions.
Answer:
Both the equation and its inverse are functions.
Step-by-step explanation:
A function is relation in which one input gives one and only one output.
Here, the given function,
[tex]f(x)=5x+1[/tex]
Which is a polynomial,
A polynomial is a function because for each input value it gives only one output value.
⇒ f(x) is a function.
Now, For finding the inverse of f(x),
Replace f(x) by y,
y = 5x + 1
Switch x and y,
x = 5y + 1
Isolate y on the left side,
-5y = 1 - x
[tex]y = \frac{1-x}{-5}=\frac{x-1}{5}[/tex]
Replace y by [tex]f^{-1}(x)[/tex],
[tex]f^{-1}(x)=\frac{x-1}{5}[/tex]
Which is also a polynomial,
Hence, the inverse of f(x) is also a function,
Last option is correct.
Consider the two conditional statements. Draw a conclusion from the given conditional statements, and write the contrapositive of each conditional statement. Then, draw a conclusion from the two contrapositives. How does the first conclusion relate to the second conclusion?
If you are eating a banana, then you are eating fruit.
If you are eating fruit, then you are eating food.
a.If you are eating a banana, then you are eating food.
If you are not eating a banana, then you are not eating fruit. If you are not eating fruit, then you are not eating food.
If you are not eating a banana, then you are not eating food.
The second conclusion is the contrapositive of the first conclusion.
b.
If you are eating a banana, then you are eating food.
If you are eating fruit, then you are eating a banana. If you are eating food, then you are eating fruit.
If you are eating food, then you are eating a banana.
The second conclusion is the contrapositive of the first conclusion.
c.If you are eating a banana, then you are eating food.
If you are not eating fruit, then you are not eating a banana. If you are not eating food, then you are not eating fruit.
If you are not eating food, then you are not eating a banana.
The second conclusion is the contrapositive of the first conclusion.
d.If you are eating food, then you are eating a banana.
If you are not eating fruit, then you are not eating a banana. If you are not eating food, then you are not eating fruit.
If you are not eating food, then you are not eating a banana.
The second conclusion is the contrapositive of the first conclusion.
Answer:
c is the answer
Step-by-step explan ation:
On traditional maps, Earth is represented in a flat plane, or by Euclidean geometry. However, a globe is a more accurate model that comes from elliptical geometry. How does a globe represent the fact that there are no parallel lines in elliptical geometry? The equator is not parallel to any other latitudinal lines. The North and South Poles are never connected by a geodesic. The geodesics connecting the North and South Poles never intersect. The geodesics connecting the North and South Poles intersect at both of the Poles.
Answer:
D. The geodesics connecting the North and South Poles intersect at both of the Poles
Step-by-step explanation:
Answer:
D) The geodesics connecting the North and South Poles intersect at both of the Poles.
Step-by-step explanation:
got it right on edge 2021 :)
You and your friend get the same magazine. You spend $15 for twelve issues. Your friend pays $1.50 per issue but gets the first two issues free. How many issues will your friend get if he also spends $15?
A sixth-grade class has 12 boys and 24 girls.
Write two more statements comparing the number of boys in the class to the number of girls
If a radical is multiplied by a number or variable, you should put the number or variable _____ the radical sign.
Final answer:
Numbers or variables are placed outside of the radical sign when multiplied by a radical. This representation indicates that the entire radical, not just the number inside, is to be multiplied by that number or variable.
Explanation:
If a radical is multiplied by a number or variable, you should put the number or variable outside the radical sign. In mathematics, multiplication or division by the same number on both sides of an equation does not change the equality. When you multiply a radical by a number or variable, you are essentially multiplying the contents inside the square root by that number or variable, but outside of the radical sign to maintain proper order of operations.
When writing an expression involving radicals mathematically, numbers or variables outside the radical do not directly interact with the values inside until simplification or further operations are performed. For example, if you're multiplying 3 by √2, you would write it as 3√2, not √(3×2). The multiplication of the coefficient (the number in front of the radical) applies to the entire radical, not just the number inside it.
what is 4,548 in expanded form ?