A scientist needs 1.8 liters of a 22% alcohol solution. She has available a 33% and a
17% solution. How many liters of the 23% and how many liters of the 17%
solutions should she mix to make the 22% solution?
Step-by-step explanation:
the approach of the other answer is basically correct, but we need to use the correct numbers.
so, I assume that the 33% of the first solution is correct, and not the 23% mentioned later.
x = liters of the 33% solution.
y = liters of the 17% solution.
we know that
x + y = 1.8
and therefore
x = 1.8 - y
and then we want to enforce the desired result (ab% are simply 0.ab)
0.33x + 0.17y = 0.22×1.8
we use the identity from above in this equation :
0.33(1.8 - y) + 0.17y = 0.396
0.594 - 0.33y + 0.17y = 0.396
0.198 - 0.16y = 0
0.198 = 0.16y
y = 1.2375 liters
x = 1.8 - y = 1.8 - 1.2375 = 0.5625 liters
if the first solution is truly only 23%, then we only need to change the number :
0.23(1.8 - y) + 0.17y = 0.396
0.414 - 0.23y + 0.17y = 0.396
0.018 - 0.06y = 0
0.018 = 0.06y
y = 0.3 liters
x = 1.8 - y = 1.8 - 0.3 = 1.5 liters
Which one doesnt belong
Answer:
267 times 6
Step-by-step explanation:
ANSWER its one question
Answer:
x = 12, y = 60
Step-by-step explanation:
We have parallel lines, so alternate interior angles are congruent.
6x + 3 = 75
6x = 72
x = 12
The interior angles of a triangle add up to 180 degrees.
45 + 75 + y = 180
120 + y = 180
y = 60
Help im litteraly failing
The solution to the given system of linear equations is x = 3, y = -3. That is, (3, -3)
The graph of the system of equations is shown below
Solving system of linear of linear equationsFrom the question, we are to determine the apparent solution to the given system of linear equations
The given system of equations is
y = -2x + 3
y = 1/3x - 4
Set the two equations equal
That is,
-2x + 3 = 1/3x - 4
Multiply through by 3
-6x + 9 = x - 12
Add 6x to both sides of the equation
-6x + 6x + 9 = x + 6x - 12
9 = 7x - 12
Add 12 to both sides of the equation
9 + 12 = 7x - 12 + 12
21 = 7x
x = 21/7
x = 3
Substitute the value of x into the first equation
y = -2x + 3
y = -2(3) + 3
y = - 6 + 3
y = - 3
The solution is (3, -3)
The graph is shown below
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Which method describes an observational study? Method 1 is an observational study because past data are collected and analyzed. Method 2 is an observational study because two city schools are chosen to participate. Method 2 is an observational study because students can choose to participate in the music lessons. Both methods are observational studies because both include students who do and do not play a musical instrument.
Both methods are observational studies because both include students who do and do not play a musical instrument. So, this method describes an observational study.
Several various kinds of non-experimental studies in which behavior is routinely observed and documented are together referred to as observational research. A variable or combination of variables must be described in order to be the focus of observational research.
In a broader sense, the objective is to capture a moment in time of certain traits of a person, group, or environment. We cannot draw causal inferences from observational research since nothing is altered or controlled, as previously said, making it non-experimental. Although they may also be quantitative or both, the data that are gathered in observational research investigations are frequently qualitative in nature (mixed-methods).
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Answer:
IF ITS THIS QUESTION
An article in a psychology journal claims that young students who play a musical instrument tend to have higher test scores on state math exams. To assess the claim, a government official considers two methods to collect data.
Method 1: Contact many city schools and ask them to provide summary data on state math exam performance and students who participate in music lessons.
Method 2: Choose two city schools and provide free music lessons to students who register. At the end of the year, compare state math exam scores for students who participated in the music lessons with the scores for those who did not.
Step-by-step explanation:
THE AWNSER IS C
Method 2 is an observational study because students can choose to participate in the music lessons.
An observational study is a type of research in which researchers observe and record the behavior of a group of individuals, but do not manipulate or intervene in any way. In this case, Method 2 describes an observational study because the researchers are not manipulating the students' participation in music lessons. Instead, the students are free to choose whether or not to participate in the music lessons, and the researchers simply observe and record the state math exam scores for both groups of students. In contrast, Method 1 is not an observational study because it involves collecting summary data on state math exam performance and music lesson participation, rather than observing and recording the behavior of the students.
Please help can’t figure out running out of time
The Inverse Function Line Test
A given graph represents a function only if for every value of x there is only one corresponding value of y.
This can be checked by using a vertical line and moving it through the x-axis. If that line intersects the graph more than once, then the graph does not correspond to a function.
The image shows a graph and if we move our imaginary vertical line from x=-2 to x=7 that line would intersect the graph only once. This means that the graph corresponds to a function in the domain [-2,7].
For the inverse function to exist, the horizontal line test must be passed.
Imagine a horizontal line moving through the y-axis. It would intersect the graph only once from y=0 to y=6.
We can conclude this graph corresponds to a function and it has an inverse function because it passed the horizontal line test.
Answer: D.
What are the similarities and differences between these problems
Using an exponential function, it is found that:
The pool has 1106 gallons after 50 minutes.The poll will have less than 1000 gallons after 66.6 minutes.What is an exponential function?An exponential function is modeled according to the following rule:
[tex]y = ab^{\frac{x}{n}}[/tex]
In which:
a is the initial value.b is the rate of change.n is the period of the change of change.Considering that the pool has 1500 gallons, and drains 3% every 5 minutes, the parameters of the function are given as follows:
a = 1500, b = 1 - 0.03 = 0.97, n = 5.
Hence the amount of water in the poll after x minutes is given by:
[tex]y = 1500(0.97)^{\frac{x}{5}}[/tex]
After 50 minutes, the amount of water in the pool is:
[tex]y = 1500(0.97)^{\frac{50}{5}} = 1500(0.97)^{10} = 1106[/tex]
1106 gallons.
The poll will have less than 1000 gallons when:
y = 1000 (we can use it because the function decreases continuously).
Hence:
[tex]1500(0.97)^{\frac{x}{5}} = 1000[/tex]
[tex](0.97)^{\frac{x}{5}} = \frac{1000}{1500}[/tex]
[tex](0.97)^{\frac{x}{5}} = \frac{2}{3}[/tex]
[tex]\log{(0.97)^{\frac{x}{5}}} = \log{\left(\frac{2}{3}\right)}[/tex]
[tex]\frac{x}{5}\log{0.97} = \log{\left(\frac{2}{3}\right)}[/tex]
[tex]x = 5\frac{\log{\left(\frac{2}{3}\right)}}{\log{(0.97)}}[/tex]
x = 66.6 minutes.
What is the missing information?The capacity of the pool is missing, and it is of 1500 gallons.
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Find the ordered pair (x,y) 6x-y=6
Answer:
Step-by-step explanation:
(1,0),(2,6). Explanation: express the equation, giving y in terms of x. ⇒y=6x−6. now choose any value for x , substitute into the equation
There are 15 squares and 6 triangles. What is the simplest ratio of triangles to total shapes?
Answer: 2:7
Step-by-step explanation:
[tex]\displaystyle\\\frac{6}{15+6} =\\\\\frac{6}{21} =\\\\\frac{2(3)}{7(3)} =\\\\\frac{2}{7} =\\\\2:7[/tex]
The ratio of triangles to total shapes in simplest form is 2 : 7.
What are ratio and proportion?A ratio is a comparison between two similar quantities in simplest form.
Proportions are of two types one is the direct proportion in which if one quantity is increased by a constant k the other quantity will also be increased by the same constant k and vice versa.
In the case of inverse proportion if one quantity is increased by a constant k the quantity will decrease by the same constant k and vice versa.
Given, There are 15 squares and 6 triangles.
Therefore, The total number of shapes is (15 + 6) = 21.
So, The ratio of triangles to total shapes is,
triangle/total shapes = 5/15 + 6.
triangles/total shapes = 6/21.
triangles : total shapes = 6 : 21 = 2 : 7
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The festival of Midnight Sun Theatre has 7875 seats arranged in 75 equal rows. How many seats are in each row?
Answer:
105 cause you will divide to get the total
write the fraction for the following
Answer:
A- 2/4
simplified-1/2
B- 3/5
C- 4/9
D-3/3 which=1
so basically D is 1
hope this helped
please mark as brainliest and have a good day!
Step-by-step explanation:
PLEASE HELP! this is probably easy, THANK YOU! please let me know if you can’t see properly it is a little hard to see thank you
HELP ASAP NEEDS TO BE DONE BEFORE TONIGHT
The equation of the straight line is 3y + 2x = 15
The generic form of a straight line, Ax + By = C, is also the typical form for two-variable linear equations.
Standard form is used, for instance, in the linear equation 4x+7y= 1. This method makes it easy to find the two intercepts (x and y) of an equation.
Y = mx + c is the cartesian equation for a straight line, where m denotes the gradient or slope of the line and c denotes the location of its y-axis intersection.
Two geometrical objects are perpendicular if they cross at a right angle.
We are aware that the product of the slopes of two lines when they are perpendicular equals -1.
The given straight line is of the form y =3/2 x - 1 .
Slope of the straight line = 3/2
Slope of the perpendicular(90°) line (m) = -2/3
The equation of a line is formulated by :
y -y₁ = m (x - x₁ )
The straight line passes through (-3 , 7)
∴y - 7 = -(2/3) (x + 3 )
or, -2x - 6 = 3y - 21
or, 3y + 2x = 15
Therefore the equation of the straight line is 3y + 2x = 15 .
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multiply the polynomials (3x^2-5x+7) and (2x^2-5x+7). Simplify the answer
The multiplication of polynomials (3x² - 5x + 7) and (2x² - 5x + 7) is:
6x^4 - 25x³ + 60x² - 70x + 49
In this question, we have been given two polynomials 3x² - 5x + 7 and 2x² - 5x + 7
We need to multiply given polynomials.
(3x² - 5x + 7) × (2x² - 5x + 7) ............(Given polynomials)
= 3x²(2x² - 5x + 7) - 5x(2x² - 5x + 7) + 7(2x² - 5x + 7) ..........(Distribute)
= 6x^4 - 15x³ + 21x² - 10x³ + 25x² - 35x + 14x² - 35x + 49 .....(Simplify)
= 6x^4 - 15x³ - 10x³ + 21x² + 25x² + 14x² - 35x -35x + 49
= 6x^4 - 25x³ + 60x² - 70x + 49
Therefore, the multiplication of polynomials (3x² - 5x + 7) and (2x² - 5x + 7) is 6x^4 - 25x³ + 60x² - 70x + 49
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is 120% reduction or enlargement
120% is considered an enlargement since the scale factor is greater than one.
What is an equation?An equation is an expression that shows the relationship between two or more numbers and variables.
Equations are classified based on degree (value of highest exponents) as linear, quadratic, cubic and so on. Variables can be dependent or independent. Dependent variables depend on other variable while an independent variable do not depend.
It is considered a reduction of the scale factor is less than one, and an enlargement if the scale factor is greater than one.
120% = 1.2 > 1, hence an enlargement.
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Can someone please help me with this problem?
Answer:
Symmetric property of congruence
What Property’s are used in each step?
Step 1 5x+9+5x+12=(5x+9)+(5x+12)
Step 2 = 5x+(9 +5x)+12
Step 3 = 5x+(5x+9)+12
Step 4 =(5x+5x)+(9+12)
Step 5 = (5 + 5)x+ (9 + 12)
Step 6 = 10x + 21
The property used is Distributive property
What is Distributive property ?
The distributive property states that multiplying the sum of two or more addends by a number yields the same outcome as multiplying each addend separately by the number and combining the resulting products.
Given, equation
5x+9+5x+12
Step 1 =(5x+9)+(5x+12)
Step 2 = 5x+(9 +5x)+12
Step 3 = 5x+(5x+9)+12
Step 4 =(5x+5x)+(9+12)
Step 5 = (5 + 5)x+ (9 + 12)
Step 6 = 10x + 21
The property used in this equation is called Distributive property
Hence, the property use in here Distributive property
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Which statement cannot be assumed based on the diagram?
A) <GBE and <DBC are adjacent
B) <DBC is vertical to <FDE
C) <EDF and <EDC are adjacent
D) <ABG and <GBD are adjacent.
help please :)
The statement that cannot be assumed based on the diagram is ∠DBC is vertical to ∠FDE.
(A) ∠GBE and ∠DBC are adjacent angles. As we can see from the diagram, they have a common ray starting from the point B.(B) We cannot say that ∠DBC is vertical to ∠FDE from the diagram as we have no such direct relation between the angles.(C) ∠EDF and ∠EDC are adjacent angles. As we can see from the diagram, they have a common ray starting from the point D.(D) ∠ABG and ∠GBD are adjacent angles. As we can see from the diagram, they have a common ray starting from the point B.To learn more about angles, visit :
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Help pls thank you geo 10th
Solving for f
Adjacent angles of a parallelogram are supplementary, so (f+30)+72=180. It follows that f=78.
Solving for g
Opposite sides of a parallelogram are congruent, so 25=8g-3. It follows that g=3.5.
a=96.5 rounded to 1 DP
b= 6.48 rounded to 2 DP
Find the maximum of a - b
how do you find B and M in y = 9 - 5x ?
For the linear function y = 9 - 5x, it is found that:
The coefficient M is the slope of M = -5.The coefficient B is the intercept of B = 9.How to identify coefficients m and b in a linear function?A linear function, in slope-intercept format, is modeled according to the following rule below:
y = mx + b
In which:
The coefficient m is the slope of the function, which is the rate of change of the function, that is, the change in y divided by the change in x.The coefficient b is the y-intercept of the function, which is the the value of y when the function crosses the x-axis(x = 0).In the context of this problem, the linear function is modeled as follows:
y = 9 - 5x.
In standard format, with the slope in front, we have that:
y = -5x + 9.
Meaning that the coefficients are given as follows:
m = -5, which is the slope of the function.b = 9, which is the intercept of the function.More can be learned about linear functions at https://brainly.com/question/24808124
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I need help with my work
Answer:
1. acute angle (less than <90)
2. right angle (approximately <90)
3. obtuse angle (more than <90)
4. acute angle (less than <90)
The midpoint of RS is M(9, 2). One endpoint is S(10, 3). Find the coordinates of the other
endpoint R.
Write the coordinates as decimals or integers.
Answer: R(8,1)
Step-by-step explanation:
[tex]\displaystyle\\M(9,2)\ \ \ \ S(10,3)\ \ \ \ R(x,y)=?\\\\M_x=\frac{R_x+S_x}{2} \\\\\Rightarrow\ 9=\frac{x+10}{2\\\\}[/tex]
Multiply both parts of the equation by 2:
[tex]9(2)=x+10\\18=x+10\\18-10=x+10-10\\8=x[/tex]
[tex]\displaystyle\\M_y=\frac{R_y+S_y}{2} \\2=\frac{y+3}{2}[/tex]
Multiply both parts of the equation by 2:
[tex]2(2)=y+3\\4=y+3\\4-3=y+3-3\\1=y[/tex]
⇒ R(8,1)
QuestionQuestion 1Consider the function y=x - 5.What are the domain and range of this function?
According to the given function, which contains a square root, the domain must contain numbers that are greater than or equal to 5, otherwise, we would obtain the square root of a negative value, which is not real.
It means that the domain is
[tex]x\ge5[/tex]The range contains numbers greater than 0, this is because the minimum value of the domain is 5, when we evaluate the function at this value, the result is 0, which means that the range is:
[tex]x\ge0[/tex]The answer is the first option.
A shop advertised a 25% off sale. If a coat is originally sold for $256. What's the decrease in price and sale price
Answer: The decrease in price is $64, and the sale price is $192.
Step-by-step explanation:
0.25 * $256 = $64
$256 - $64 = $192
what property does 5(a) = a(5) belong to?
Associative Property
Commutative Property
Inverse Property
Identity Property
Answer:
Commutative Property for Multiplication
Answer:
Commutative Property for Multiplication
Step-by-step explanation:
Find the surface area of the figure
farm b has a 200 ft well that uses 10000 cubic feet of natural gas per year. if the cost of natural gas is the same a farm a, what is the annual cost to operate this well
Annual cost to operate farm B well with cost of natural gas $2.50 per 1,000 cubic feet and uses of 10000cubic feet of natural gas per year is $25.
As given,
Farm A:
Cost of natural gas per 1,000 cubic feet=$2.50
Farm B:
Uses of natural gas per year = 10000cubic feet
Cost of natural gas of farm B is same as farm A
Cost of natural gas per 1,000 cubic feet=$2.50
⇒1cubic feet=2.50/1000
Annual cost to operate 200ft well that uses 10000 cubic feet natural gas
10000 cubic feet=(2.50 ×10000)/1000
=$25
Therefore, annual cost to operate farm B well with cost of natural gas $2.50 per 1,000 cubic feet and uses of 10000cubic feet of natural gas per year is $25.
The complete question is:
Farm A has a 100 ft well that uses 7,000 cubic feet of natural gas per year. If the cost of natural gas for farm A is $2.50 per 1,000 cubic feet. And farm B has a 200 ft well that uses 10000 cubic feet of natural gas per year. if the cost of natural gas is the same a farm A, what is the annual cost to operate this well?
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Simplify (2√5)²
Please help fast!
Answer:
20
Step-by-step explanation:
Simplify the following:
(2 sqrt(5))^2
Multiply each exponent in 2 sqrt(5) by 2:
2^2×5^(2/2)
2/2 = 1:
2^2×5
2^2 = 4:
4×5
4×5 = 20:
Answer: 20
Use the given information to find mZKJR.
m/RJI=12x-3, m/KJR = 6x - 5,
and m/KJI = 172°. Find m/KJR.
The measure of ∡KJR is 69°.
What is the sum of two supplementary angles?
Two angles are referred to as supplementary angles if their combined value is 180°. A straight angle is created when supplementary angles are combined (180°).
In other words, ∡A and ∡B are supplementary if ∡A plus ∡B equals 180°. Angles A and B are described as "supplements" of one another in this context.
In math, A° + B° = 180°.
Given, m∡RJI = 12x - 3, m∡KJR = 6x - 5, m∡KJI = 172°
As seen from diagram, m∡RJI + m∡KJR = m∡KJI
⇒ (12x-3)+(6x-50) = 172° ⇒ 18x - 53 = 172° ⇒ x = ([172 + 53]/18)° = 12.5°
Therefore, the value of x = 12.5°
Thus, m∡KJR = 6x - 5 = (6*12.5) - 5 = 69°
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