an automobile radiator contains 20 L of antifreeze and water. this mixture is 20% antifreeze. how much of this mixture should be drained and replaced with pure antifreeze so that the mixture will be 50% antifreeze.
Answers
1. to make up the scheme of changes; 2. to make up the system of the equations according to the scheme.
Note, that antifreeze is marked by black in the picture.
Final answer:
To make a 20L mixture 50% antifreeze, 7.5L of the mixture should be drained and replaced with pure antifreeze. This calculation is based on the original 20% antifreeze concentration and the goal of reaching a 50% concentration without changing the total volume.
Explanation:
The question asks how much of a 20L mixture, which is 20% antifreeze, needs to be drained and replaced with pure antifreeze so the mixture will be 50% antifreeze. To solve this, first calculate the current amount of antifreeze in the mixture: 20L * 20% = 4L. Let's say x liters are drained and replaced with pure antifreeze. The volume of the solution does not change, the remaining 20L. After replacement, the quantity of antifreeze is (4 - 0.2x + x) liters (since we subtract the antifreeze drained, which is 20% of x, and add back x liters of pure antifreeze), and we require this to be 50% of the total, which is 10L (50% of 20L).
Setting up the equation: 4 - 0.2x + x = 10. Simplifying gives 0.8x = 6, so x = 7.5. Therefore, 7.5L of the mixture should be drained and replaced with pure antifreeze to achieve a 50% concentration.
Related Questions
Let p: x = 4 Let q: y = −2 Which represents "If x = 4, then y = −2”? p ∨ q p ∧ q p → q p ↔ q
Answers
Have a brainy day!
Answer:
C. p → q
Step-by-step explanation:
We are given that,
'p' is represented by 'x = 4' and 'q' is represented by 'y = -2'.
That is, we have,
p: x = 4
q: y = -2
The given statement is, 'If x = 4, then y = -2'.
This means that whenever x = 4, then y = -2.
That is, 'x = 4 implies y = -2'.
Thus, it will be represented by p → q.
what is the LCM of 6 and 8
Answers
LCM stands for "Least Common Denominator."
The LCM is the smallest common multiple of two numbers.
To find the LCM of 6 and 8, follow these easy steps.
1. Find the prime factorization of both numbers.
6 = 2 × 3
8 = 2 × 2 × 2
Next, multiply each factor the number of times we did above.
LCM = 2 × 2 × 2 × 3
LCM = 24
ANSWER:
The LCM of 6 and 8 is 24.
6 x 1 = 6
6 x 2 = 12
6 x 3 = 18
6 x 4 = 24
6 x 5 = 30
===================================================================
8 x 1 = 8
8 x 2 = 16
8 x 3 = 24
8 x 4 = 32
8 x 5 = 40
Now find the multiple that matches first (which is 24)
Your LCM is 24
Average speed of Car 1 = 55 mph.
Average speed of Car 2 = 70 mph.
Time elapsed between start of Car 1 and start of Car 2 = 4 minutes.
How long before Car 2 overtakes Car 1? __hour(s).
Answers
Answer: 11/45 hour (≈15 min.)
An open area at a local high school is in the shape of a quadrilateral. two sidewalks crisscross this open area as diagonal of the quadrilateral. If the walkways cross at their midpoints and the walkways are equal in length, what is the shape of the open area?
a rectangle
a rhombus
a parallelogram
a trapezoid
Answers
Based on the properties of quadrilaterals, if the diagonals are congruent and bisect each other, it is a rectangle.
Solve this equation: 3x-1/5-2/9x=124/5
Step 1: Simplify by combining like terms. Which terms can be combined?
A) 3x and -1/5
B) -1/5 and -2/9x
C) 3x and -2/9x
Answers
Answer:
The correct option is C.
Step-by-step explanation:
The given equation is
[tex]3x-\frac{1}{5}-\frac{2}{9}x=\frac{124}{5}[/tex]
If two terms have the same variables having same powers, then they are known as like terms.
In the given equation [tex]3x[/tex] and [tex]-\frac{2}{9}x[/tex] are like terms.
So, when we simplify the given equation by combining like terms. we need to combined [tex]3x[/tex] and [tex]-\frac{2}{9}x[/tex] .
Therefore the correct option is C.
The solution to the equation is approximately x = 45.48.
To solve the equation 3x - 1/5 - 2/9x = 124/5, to combine like terms. Like terms are terms that have the same variable and exponent.
The terms in the equation are:
3x (coefficient is 3, and the variable is x)
-1/5 (coefficient is -1/5)
-2/9x (coefficient is -2/9, and the variable is x)
Now, let's identify the like terms that combined:
C) 3x and -2/9x
The terms 3x and -2/9x both have the variable x, so they are like terms and can be combined.
Step 1: Combine the like terms:
3x - 2/9x = (3 - 2/9)x = (27/9 - 2/9)x = (25/9)x
Now, after combining the like terms, the equation becomes:
(25/9)x - 1/5 = 124/5
Step 2: Isolate x on one side of the equation. To do this, we can first get rid of the fraction by multiplying the entire equation by the least common multiple (LCM) of the denominators, which is 45 (LCM of 9 and 5):
45 × [(25/9)x - 1/5] = 45 × (124/5)
This simplifies to:
25x - 9 = 1128
Step 3: Now, isolate x by moving the constant term (-9) to the other side of the equation:
25x = 1128 + 9
25x = 1137
Step 4: Finally, divide by 25 to solve for x:
x = 1137 / 25
x ≈ 45.48
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A wall map has a scale of 128 miles = 6 inches. The distance between Springfield and Lakeview is 2 feet on the map. What is the actual distance between Springfield and Lakeview? Question 4 options: 42.7 miles 1.13 miles 512 miles 384 miles
Answers
2 feet = 24 inches
128 miles/6 inches is the scale.
I would create an equivalent ratio using this scale and the 24 inches.
128 miles/6 inches=x miles/24 inches
To go from 6 inches to 24 inches, you will need 4 groups of 6 inches.
You would also need 4 groups of 128 miles.
4 x 128 = 512 miles
The distance between these 2 towns is 512 miles.
The sum of two numbers is 52. If twice the smaller number is subtracted from the larger number, the result is 13. Find the two numbers.
Answers
Larger number = y Twice the smaller number subtracted from the larger
Smaller number = x is equal to 13:
y - 2x = 13 Solve for y: y = 2x + 13 Then substitute your value for y into the equation they gave you at the beginning:
(2x + 13) + x = 52 Solve the equation by simplifying:
3x = 52 - 13 3x = 39 x = 13 Then substitute your value for x (13) into the equation we made to solve for y:
y - 2(13) = 13 y - 26 = 13 y = 39
So your answer is, "The two numbers are 13 and 39."
Evaluate the Expression - show your work :)
Thanks!
Answers
The answer is (n+3)!
What is the equation, in point-slope form, of the line that is perpendicular to the given line and passes through the point (2, 5)?
y + 5 = x + 2
y − 2 = x − 5
y − 5 = −(x − 2)
y + 2 = −(x + 5)
Answers
We are given point (2,5).
We need to find the equation of line perpendicular to the given line and passes through the point (2, 5).
We know point-slope form :
y-y1 = m(x-x1).
Plugging values of (x1,y1) = (2,5) in above slope-intercept form, we get
y - 5 = m(x-2).
Which matches 3rd option y − 5 = −(x − 2).
So, the correct option is y − 5 = −(x − 2).Answer:
The answer is C.
Step-by-step explanation:
You are making lemonade for your lemonade stand. Each liter of lemonade you make uses 3.5 tablespoons of lemonade powder, and you have 14 tablespoons of lemonade powder. Can you make 5 liters of lemonade?
Answers
You can use a calculator for this question.
Greg builds a new pond which has a volume of 7.35 m3.
It is 4.2 m long and 50 cm deep.
What is the width of the pond? m
There will be a circular patio with a diameter of 7 metres.
Greg is going to put a tiled edge around the patio.
What is the circumference of the patio? m
Circumference of a circle = 2πr
Use π = 3.14
Answers
2) C = 7pi = 21.98 m
A bedroom is 15 ft long and 12 ft wide. How much will it cost to carpet the room if carpeting coats $22 per square foot. (1 yd=3 ft)
Answers
A = bh
A = 15(12)
A = 180
The area of the bedroom is 180 square feet. The cost of carpeting the entire bedroom will be the amount of square feet of the bedroom (its area) times the cost per square foot of carpet. Multiply the area by the cost per square foot.
180 × 22 = 3960
It will cost $3,960 to carpet the bedroom.
PLEASE HELP WILL MARK BRAINLIEST
Answers
.. rectangle + trapezoid = (4 ft)*(24 ft) +(4 ft +8 ft)*(16 ft)/2 = 192 ft^2
.. rectangle + triangle = (4 ft)*(40 ft) +(1/2)*(4 ft)*(16 ft) = 192 ft^2
The side area is multiplied by the width to find the volume.
.. V = (192 ft^2)*(20 ft) = 3840 ft^3 . . . . . . maximum water volume
_____
That's a pint or so more than 28,725 gallons.
A snail crawls at a pace of 3 cm a minute. What is the snail Pace in feet per hours?
Answers
and there is 60 minutes in an hour.
3 * 60 = 80
80 / 30 = 2.666666666 feet
The snail travels about two feet per hour.
Answer: 2
Mae's cat weighs 5 3/8 pounds. What is the weight written as a decimal
?
Answers
Reasoning: 8 goes into 3, 0.75 times plus 5 pounds
2/5 of the Jazz is by musicians from New Orleans. How much of New Orleans music does Ivan have
Answers
Ivan has 24 minutes of New Orleans jazz on his MP3 player.
To find out how much of an hour of New Orleans jazz Ivan has, we use the following steps:
1. We know that Ivan has an hour of jazz music on his MP3 player.
2. We are given that 2/5 of this jazz music is by musicians from New Orleans.
3. To find out how much of New Orleans jazz music that is, we calculate 2/5 of 1 hour.
Here's the calculation:
[tex]\( \frac{2}{5} \times 1 \text{ hour} = \frac{2}{5} \times 60 \text{ minutes} \)[/tex]
[tex]\( \frac{2}{5} \times 60 = \frac{120}{5} \text{ minutes} \)[/tex]
[tex]\( \frac{120}{5} = 24 \text{ minutes} \)[/tex]
Therefore, Ivan has 24 minutes of New Orleans jazz on his MP3 player.
complete question given below:
Help pleaseeeeeeeeeeeeeeeeee
Answers
a = 12
k = 0.2
v(x) = 0 at the maximum after differentiation
V(x) = kx(a - x)
The easiest way to do this is to remove the brackets.
V(x) = akx - kx^2 Substitute the constants
V(x) = 12*0.2*x - 0.2x^2
V(x)/dx = 2.4 - 0.4x = 0 at the maximum
2.4 - 0.4x = 0
0.4x = 2.4
x = 2.4/0.4
x = 6
If you don't know any calculus yet, you can do this by completing the square.
Trigonometric Identities and Applications? help
Answers
[tex]\bf cos^{-1}\left( \frac{8}{-15}\right)=\stackrel{radians}{\stackrel{II~quadrant}{\approx 2.13}~~,~~\stackrel{III~quadrant}{\approx 4.15}}\qquad \qquad t= \begin{cases} \frac{5}{2\pi }\cdot 2.13\\\\ \frac{5}{2\pi }\cdot 4.15 \end{cases}[/tex]
On a coordinate grid, point M is at (−8, 2) and point S is at (10, 2). The distance (in units) between points M and S is ______. (Input only whole numbers, such as 2.)
Answers
d=√(x2-x1)² + (y2-y1)²
d=√(-8-10)² + (2-2)²
d=√(-18)² + 0
d=18
Let P be the point (1,1,-2). Suppose that the point P0(2, -5, 2) is 1/5 of the way from P to Q. Find the point Q.
Answers
Q = 4P0 -4P +P0
Q = 5P0 -4P
Q = 5(2, -5, 2) -4(1, 1, -2)
Q = (6, -29, 18)
a rectangular swimming pool is 3 meter wide. The surface area is 30 sq meters...what is the length of the pool?
Answers
In the Venn diagram, consider U = {students in 10th grade at Lee High School}.
The diagram shows the electives chosen by the students in the 10th grade.
How many students chose to participate in the painting class?
Answers
We have been given a Venn diagram in which U = {students in 10th grade at Lee High School}. We are asked to find how many students have chosen to participate in the painting class.
We can see from our Venn diagram that 3 students are participating in chorus and painting. 2 students are participating in chorus, theater and painting. 4 students are participating in painting and theater.
To find total students who have chosen to participate in the painting class we will add all the students who are participating in other activities with painting.
[tex]\text{Students participating in painting class}=8+3+2+4[/tex]
[tex]\text{Students participating in painting class}=17[/tex]
Therefore, 17 students have chosen to participate in painting class.
Answer:
17
Step-by-step explanation:
what is 87/96 feet in inches
Answers
what function is vertically stretched by a factor of 3 and translated 4 units right from the parent function
A. log_(5) (3x+4)
B. 3log_(5) (x-4)
C. 3(5^x+4)
D. 5^3x-4
Answers
Final answer:
The correct function is B, 3log_5(x-4), which represents a logarithmic function that is vertically stretched by a factor of 3 and translated 4 units to the right.
Explanation:
The student is asking about transformations of a parent function, specifically a vertical stretch and a horizontal translation. When a function is vertically stretched by a factor of 3, this involves multiplying the function by 3. A translation of 4 units to the right would mean adjusting the input variable x by subtracting 4. Considering the options given, option B, 3log5(x-4), is the correct answer because it represents a function that has been vertically stretched by a factor of 3 and horizontally translated 4 units to the right from its parent function log5x.
What is 51.875 rounded to the nearest tenth
Answers
You estimate the distance from your house to your school to be 1.6 miles. The actual distance is 1.9 miles. Find the percent error. Round your answer to the nearest tenth of a percent.
Answers
[tex]% Error = \frac{final value - given value}{given value} [/tex]
% error = (1.6 - 1.9)/1.9 * 100% = 15.79%
Final answer:
The percent error of the estimated distance from your house to school is 15.8% when rounded to the nearest tenth.
Explanation:
To find the percent error of your estimate, you use the formula:
Error = (|Estimated value - Actual value| / Actual value) × 100
Plugging the values from your question:
Error = (|1.6 miles - 1.9 miles| / 1.9 miles) × 100
Error = (|-0.3 miles| / 1.9 miles) × 100
Error = (0.3 miles / 1.9 miles) × 100
Error = 0.15789473684 × 100
Error = 15.789473684%
When rounded to the nearest tenth of a percent, the percent error is 15.8%.
The population of city A is 26% less than the population of city B, so city A's population is _____% of city B's.
Answers
Answer:
The population of city A is [tex]74\%[/tex] of the population of city B
Step-by-step explanation:
Let
y------> population of the city A
x-----> population of city B
we know that
[tex](100\%-26\%)=74\%=\frac{74}{100}=0.74[/tex]
so
[tex]y=0.74x[/tex]
therefore
The population of city A is [tex]74\%[/tex] of the population of city B
Given: ABCD is a parallelogram m∠A = 60º ; BK ⊥ AD AK = KD; Perimeter of ABCD = 24 Find: BD.
Answers
Then BD = AB. Denote AB by x and AK by y.
Then,
2x+4y=24 (the perimeter)
cos 60=y/x.
From the second equation we get [tex]y=0.5x[/tex]
Plug in the first equation we get:
[tex]2x+4(0.5x)=24\\2x+2x=24\\4x=24\\x=6[/tex]
We deduce that [tex]BD=6.[/tex]
Final answer:
To find BD, we can use the fact that the opposite sides of a parallelogram are equal in length. The length of BD is 4.8 units.
Explanation:
In the given problem, we have a parallelogram ABCD with m∠A = 60º. BK is perpendicular to AD and AK = KD. The perimeter of ABCD is 24. To find BD, we can use the fact that the opposite sides of a parallelogram are equal in length. Since AK = KD, the length of AD is twice the length of AK.
Let AK = x. Then AD = 2x. The perimeter of ABCD is given by P = AB + BC + CD + AD. Substituting the given values, we have 24 = AB + BC + CD + 2x. We know that AB = CD, so the equation becomes 24 = 2AB + 2BC + 2x. Rearranging the terms, we get AB + BC + x = 12.
Using the fact that opposite sides of a parallelogram are equal in length, we can deduce that BC = AB. Substituting this into the equation, we have 2AB + AB + x = 12. Simplifying, we get 3AB + x = 12. Since AK = KD, we have x = KD. Substituting this into the equation, we have 3AB + KD = 12. Since AK = KD, we have 3AB + AK = 12. Since AK = KD, we have 3AB + 2AK = 12. Simplifying, we get 3AB + 2AB = 12. Combining like terms, we get 5AB = 12. Dividing both sides by 5, we get AB = 12/5. Since AB = CD, we have CD = 12/5. Since opposite sides of a parallelogram are equal in length, we have BD = AD = 2x = 2(12/5) = 24/5 = 4.8.
The world's smallest gecko is 3/4 inch long. An adult male Western Banded Gecko is 7 1/3 times as long. How long is an adult male Western Banded Gecko
Answers
To solve this problem, you can multiply the numbers 3/4 and 7 1/3 since it is times as long as the world's smallest gecko . . .
3/4 = 3/4
7 1/3 = 22/3
3 x 22 = 66
4 x 3 = 12
Simplifying 66/12 . . .
66/12 = 5 1/2 <-------
An adult male Western Banded Gecko is 5 1/2 inches long.
Hope this helps you.
Have a great day!
Cpm/pert graphically displays the scheduling of tasks required to complete a project.
a. True
b. False