Answer: $2.96
Step-by-step explanation:
$18.75 - $3.95 = $14.80
$14.80 / 5 = $2.96
How do variables help you model real-world situations? Give an example of a model that uses variables and explain how it helps people make predictions
A variable is a symbol and a stand-in for any mathematical object in mathematics. A variable can specifically represent a number, a vector, a matrix, a function, its argument, a set, or one of its elements.
What is meant by variables?
Any feature, characteristic, or circumstance that can exist in various amounts or types is considered a variable. Independent, dependent, and controlled variables are typically found in experiments. A variable is a symbol and a stand-in for any mathematical object in mathematics. A variable can specifically represent a number, a vector, a matrix, a function, its argument, a set, or one of its elements.
The ladder's position would serve as an illustration.
Both 4x-2y=12 and -4x-9=54 are supplied to you. You are required to determine the ladder's order. But you didn't say which variable stands in for the ladder. I'll simply solve for both variables. I'll use the substitute strategy.
Let equations one and two be equivalent to 4x-2y=12 and -4x-9=54, respectively.
4x-2y=12
4x=12+2y
x=3+1/2y
Put this x in place of it in equation 2.
-4x-9y=54
-4(3+1/2y )-9y=54
Y=-6
X=3+1/2y = 3+1/2(-6) = 3+(-3) = 0 \s.
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the Lim family are great mathematician.When asked howvold everyone are,the family replies : "our family of two adults and three childrens are 100years old altogether.The sum of father's age and son's age is 51.The father is 3 years older than mother while the twins daugthers are each 5 years younger than the brother" Can you work out everyone's age???
Answer:
Ages are as follows:
Father: 40
Mother: 37
Son: 11
Each twin daughter: 6
Step-by-step explanation:
Interesting puzzle!
Let
F denote the age of the father
M the age of the mother
S the age of the son
D the age of each of the twin daughters
Total of all ages is
F + M + S + 2D = 100 [1]
We also have
F + S = 51 ==> S = 51- F [2]
F - M = 3 ==> M = F - 3 [3]
S - D = 5 ==> D = S -5 [4]
==> D = (51-F) -5
==> D = 46 - F [5]
Substitute this in equation [1] to get
We now have everyone's age in terms of the father's age F
Substituting each of equations [2], [3] and [5] into [1] we get one equation in terms of F
F + (F-3) + (51-F) + 2(46-F) = 100
(F + F - F -2F ) + (-3 + 51 + 92) = 100
-F + 140 = 100
- F = 100 - 140
-F = -40
or
F = 40
From [3]
M = F - 3 = 40 - 3 = 37
From [2]
S = 51 - F = 51 - 40 = 11
From [4]
D = S - 5 = 11 - 5 = 6
Verify:
F + M + S + 2D = 40 + 37 + 11 + 2 x6 = 100
Step-by-step explanation:
a = father age
b = mother age
c = son age
d = daughters age
1. a + b + c + 2d = 100 (don't forget : twin-daughters)
2. a + c = 51
3. a = b + 3
4. d = c - 5
we need to transform the equations 2-4 to express 3 variables by the 4th, and then put that into the first equation and solve for that one variable.
once we have that, we can use again the equations 2-4 to solve for the other variables.
2. tells us that
c = 51 - a
3. tells us that
b = a - 3
4. and 2. tells us that
d = c - 5 = (51 - a) - 5 = 46 - a
with that we get in 1.
a + (a - 3) + (51 - a) + 2(46 - a) = 100
a + a - 3 + 51 - a + 92 - 2a = 100
2a - 3a + 48 + 92 = 100
-a + 140 = 100
-a = -40
a = 40
b = a - 3 = 40 - 3 = 37
c = 51 - a = 51 - 40 = 11
d = c - 5 = 11 - 5 = 6
so, the father is 40 years old
the mother is 37 years old
the son is 11 years old
both of the twin daughters are 6 years old.
Three more than a certain number is six less than four times
the same number. What is the number?
Answer:
number is 3
Step-by-step explanation:
let n be the number , then 3 more than the number is n + 3 and six less than 4 times the number is 4n - 6 , so
4n - 6 = n + 3 ( subtract n from both sides )
3n - 6 = 3 ( add 6 to both sides )
3n = 9 ( divide both sides by 3 )
n = 3
the number is 3
I need help with this practice problem. *Make sure to answer (a) and (b), as they are questions included in the problem*
The answers to both the subparts using the binomial theorem are shown:
(A) Summation notations: = e⁴₀(3x⁵)⁴(-1/9y³)⁰ + e⁴₁(3x⁵)³(-1/9y³)¹ + e⁴₂(3x⁵)²(-1/9³)² + e⁴₃(3x⁵)(-1/9y³)³ + e⁴₄(3x⁵)⁰(-1/9y³)⁴(B) Simplified terms of the expansion: (3x⁵ - 1/9y³)⁴ = 81x²⁰ - 12x¹⁵y³ + 2/3x¹⁰+y⁶ -4/243x⁵y⁹ + 1/2187y¹²What is the binomial theorem?An expression that has been raised to any finite power can be expanded using the binomial theorem. A useful expansion technique with applications in probability, probability theory, and algebra is the binomial theorem. A binomial expression is an algebraic expression with two terms that are not the same.Or in simpler terms, the nth power of the sum of two numbers a and b can be represented as the sum of n + 1 terms of the form, according to the binomial theorem, which states that for any positive integer n.Probability:
Simply put, probability measures how probable something is to occur. We can discuss the probabilities of various outcomes, or how likely they are, whenever we are unsure of how an event will turn out. Statistics describes the examination of events subject to probability.(A) Summation notations:
(3x⁵ - 1/9y³)⁴= e⁴₀(3x⁵)⁴(-1/9y³)⁰ + e⁴₁(3x⁵)³(-1/9y³)¹ + e⁴₂(3x⁵)²(-1/9³)² + e⁴₃(3x⁵)(-1/9y³)³ + e⁴₄(3x⁵)⁰(-1/9y³)⁴(B) Simplified terms of the expansion:
(3x⁵ - 1/9y³)⁴ = 81x²⁰ - 12x¹⁵y³ + 2/3x¹⁰+y⁶ -4/243x⁵y⁹ + 1/2187y¹²Therefore, the answers to both the subparts using the binomial theorem are shown:
(A) Summation notations: = e⁴₀(3x⁵)⁴(-1/9y³)⁰ + e⁴₁(3x⁵)³(-1/9y³)¹ + e⁴₂(3x⁵)²(-1/9³)² + e⁴₃(3x⁵)(-1/9y³)³ + e⁴₄(3x⁵)⁰(-1/9y³)⁴(B) Simplified terms of the expansion: (3x⁵ - 1/9y³)⁴ = 81x²⁰ - 12x¹⁵y³ + 2/3x¹⁰+y⁶ -4/243x⁵y⁹ + 1/2187y¹²To learn more about binomial theorem visit:
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Nicole is selling wing plates to fundraise. She's selling the plates for $7 each. She spent $147 on the ingredients and package for the plates. Which equation represents M, her profit of money, after selling p plates of wings?
Answer:
M = 7p - 147
Step-by-step explanation:
Nicole is selling wing plates to fund raise. She's selling the plates for $7 each. She spent $147 on the ingredients and package for the plates. Which equation represents M, her profit of money, after selling p plates of wings?
profit - sales - cost of goods sold
where p = number of plates sold
M = 7p - 147
Brandon takes 1/4 of a 24-hour period to read 1/3 of his book. At this rate, how many hours will it take Brandon to complete the book?
Answer:
Step-by-step explanation:
Brandon takes 1/4 of a 24-hour period to read 1/3 of his book. At this rate, how many hours will it take Brandon to complete the book?
1/4 of 24 hours = 0.25 × 24 = 6 hours
so:
Brandon takes 6 hours to read 1/3 of his book. To read the full book, going at the same reading rate:
6 × 3 = 18
It takes Brandon 18 hours to read the book.
Reflection across x=-2
After reflection across the line x = -2, point L(-6,2), M(-6,0), K(-1,3) and J(3,0) becomes L'(1,2), M'(1,0), K'(-3,3) and J'(-1,0)
The line x = -2 will be parallel to y-axis. Let us say that there is a general point A(a,b). If this point is reflected across the line x = -2 then the y coordinates should remain same for the reflected point but x coordinate will change.
The new x coordinate will be parallelly opposite to the initial point and also at the same distance from the line as the initial point
From the Figure, we can see,
The coordinates of,
The point L is (-6,2),
The point M is (-6,0),
The point K is (-1,3) and,
The point J is (3,0).
After reflection across the line x = -2, the coordinates of,
The point L' is (1,2),
The point M' is (1,0),
The point K' is (-3,3),
The point J' is (-1,0)
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im so bad at things like this pls help
Answer:
Part A: C. 3c - 2 = c + 22
Part B: The cat weighs 12 pounds, and the dog weighs 34 pounds.
Step-by-step explanation:
Create a system of equations:
d = 3c - 2, d = 22 + c
And substitute to get the answer to part A:
22 + c = 3c - 2
If you solve the system, you get d = 34 and c = 12 as the answer to part B.
The cat weighs 12 pounds, and the dog weighs 34 pounds.
Answer: The weight of the dog is 34 pounds and The weight of the cat is 12 pounds The answer should be B I think that's the answer
Step-by-step explanation:
4z−5<−29or4z+3>15
8x+8≥−64and−7−8x≥−79
will mark brainliest
The solutions for the inequalities are:
z < -6 or z > 3 and -9 ≤ x ≤9
We are asked to solve the inequalities given.
For the inequality 4z−5<−29 or 4z+3>15, we have to solve for z. i.e., find the value for z.
4z−5<−29 or 4z+3>15
⇒ 4z < -29 + 5 or 4z > 15 -3
⇒ 4z < -24 or 4z > 12
⇒ z < -24/4 or z > 12/4
⇒ z < -6 or z > 3
The solution for z are the values above 3 and less than -6.
For 8x+8 ≥ −64 and −7−8x ≥ −79, we need to solve for x.
8x+8 ≥ −64 and −7−8x ≥ −79
⇒ 8x ≥ -64 -8 and -8x ≥ -79 + 7
⇒ 8x ≥ -72 and -8x ≥ -72
⇒ x ≥ -72/8 and -x ≥ -72/8
⇒ x ≥ -9 and x ≤ 9
⇒ -9 ≤ x ≤9
The solution for x are between -9 and 9.
The question is not complete. The complete question is given below:
Solve the system of inequalities.
4z−5<−29 or 4z+3>15
8x+8≥−64 and −7−8x≥−79.
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Help me with this rq, I’ll mark you brainlyiest
Answer: Hi this is neither.
Help pls ASAP
1a. When a lot of people are swimming in a pool, the water become cloudy. Explain why?
b. The water in an empty pool is very clear. is it still a mixture?
Explain why?
a. Inadequate chlorine levels cause cloudy or creamy swimming pool water.
b. Even though water represents the most ample substance on the planet, it is rarely encountered in its pure form in nature.
What is defined as the term mixture?A mixture is a compound composed of a number of chemical components that aren't chemically linked to one another. A mixture is a physical combination of two or more compounds that retain their individuality and are blended as solutions, suspensions, and colloids.Part a: Cloudy or milky pool water is ended up causing by seven major issues: insufficient chlorine, an imbalanced pH and alkalinity, extremely high calcium hardness (CH), a faulty or clogged filter, and the initial phases of algae, ammonia, as well as debris.
Methods for Cleaning Cloudy Pool Water
Balance the levels of free chlorine (FC).Remove the ammonia.Remove any young algae.pH and TA levels should be monitored and balanced.Part b: A swimming pool mixture of water as well as chlorine is made reference to as a homogenous mixture even though water and chlorine cannot be separated back to one‘s distinct materials once mixed together.
Because chlorine as well as water diffuse between each other, they cannot be kept separate into their pure forms again.
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Noah is studying a type of sea sponge that grows at a constant rate. They measured the age and height of 333 pieces of the sponge. Here's what they found:
Answer:
a = h/2 would be the answer.
Step;-
Find slope:-
m = rise/run = (16-8)/(8-4) = 8/4 = 2
Now,
y = mx + b
or, 8 = 2(4) + b
so, b = 0
So,
y = mx + b
or, h = 2a + 0
so, h = 2a
hence,a = h/2.
The sea sponges's height grows 2cm every 1 year, so you can write an equation to find the height at any age [tex]a = \frac{h}{2}[/tex]
Zack and Zane were floating down the river. They climbed to the top of the rock, which was 14.6 feet above the water level. When Zack jumped in, he got down to a depth of 6.8 feet underwater. What was the total distance from his highest point to his lowest point?
The total distance from his highest point to his lowest point is 21.8 feet.
Height H climbed by Zack and Zane is 14.6 feet.
The depth D underwater that Zack got down to is 6.8 feet.
The distance between the highest and the lowest point can be found by assuming the coordinates axis.
Let us assume the origin is on the water surface,
So, going by this logic, highest point is at +14.6 feet.
The lowest point is at -6.8 feet.
The distance L between lowest and highest point is,
L = H - D
L = 14.6 -(-6.8) feet
L = (14.6 + 6.8) feet
L = 21.8 feet
So the distance L is 21.8 feets.
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9.31x5.8 it seems like it needs factors and decimals and a explanation
Answer:
53.998x
Step-by-step explanation:
9.31x · 5.8
9.31 · 5.8x
=53.999x
9. Put the following equation of a line into slope-intercept
form, simplifying all fractions.
2x + 3y = 15
Step-by-step explanation:
slope-intercept form is
y = ax + b
"a" being the slope, "b" being the y-intercept (the y value when x = 0).
we have
2x + 3y = 15
3y = 15 - 2x
y = (-2/3)×x + 5
PLEASE HELP 50 POINTS
Write an equation of the line that is parallel to -x + y = 5 and passes through the point (2, -5).
Responses
y = x - 3
y = x - 3, EndFragment
y = x - 7
y = x - 7, EndFragment
y = x - 5
y = x - 5
y = - x + 7
Answer: y = x -7
Step-by-step explanation: -x + y = 5
y = x + 5
y = x + a
-5 = 2 + a
a = -7
y = x - 7
how to find the greatest number of students to whom 135pens 225 books and 315 copies can be divided equally also find the shares of each item . maths
Answer:
The items can be equally shared between 45 students.
Each student will get 3 pens, 5 books and 7 copies.
Step-by-step explanation:
We have to find the GCF (Greatest common factor) of 135 , 225 and 315.
135 = 5 * 3 * 3 * 3 = 45 * 3
225 = 5 * 5 * 3 * 3 = 45 * 5
315 = 5 * 3 * 3 * 7 = 45 * 7
GCF = 5 * 9 = 45
The items can be equally shared between 45 students.
Each student will get 3 pens, 5 books and 7 copies.
Answer for bothering x and y giving brainliest. Need help asap!!!
Answer: x = 77 - 2y y = -x/2 + (77/2)
Step-by-step explanation:
Darell and edmond are training for a marathon. darell runs 4 kilometers at a time while edmond prefers to run in blocks of 8 kilometers. at the end of a month, they realize that they have run same total number of kilometers. what is the smallest number of kilometers that each must have run?
We are trying to find the Least Common Multiple. This is a number that both 4 and 8 can be multiplied by a whole number to achieve, more specifically, the minimum of that list of numbers. This one is really simple. Since 8 is a multiple of 4 (4 x 2 = 8), the LCM is 8! (8 is also a multiple of 8 because 8 x 1 = 8).
So the answer is 8.
Solve -95- 62 -25. Then find 4t.
4x =
PLEASE HELP MEEEE!! ILL GIVE BRIANLIEST!!
Unit rate for the given expression 625 ft² in 2/3 hours is equal to
975ft² /hour.
As given in the question,
Given expression :
650 ft² in 2/3 hours
Unit rate for the given expression 625 ft² in 2/3 hours is equal to
In 2 /3 hours = 650 ft²
Simplify the given expression for the unit rate
1 hour = 650 / 2 / 3 ft² / hour
Multiply 650 to 3 and divide it by 2 we get,
1 hour = ( 650× 3 ) / 2 ft² / hour
⇒ 1 hour = 1950 / 2 ft² / hour
⇒ 1 hour = 975 ft²/hour
Therefore, unit rate for the given expression 625 ft² in 2/3 hours is equal to 975ft² /hour.
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Work out 1 1/4 + 4 2/3 Give your answer as a mixed number where appropriate.
The resultant of the given sum of the mixed number 1 1/4 + 4 2/3 will be 5 11/12.
What is a number system?The number system is a way to represent or express numbers.
Any of the multiple sets of symbols and the guidelines for utilizing them to represent numbers are included in the Number System.
As per the given sum of the mixed number,
1 1/4 + 4 2/3
⇒ 1 + 1/4 + 4 + 2/3
⇒ 1 + 4 + 1/4 + 2/3
⇒ 5 + 1/4 + 2/3
Take LCM of 1/4 and 2/3 as 12.
⇒ 5 + (3 + 8)/12
⇒ 5 + 11/12 = 5 11/12
Hence "The resultant of the given sum of the mixed number 1 1/4 + 4 2/3 will be 5 11/12".
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an electrician earns $18.per hour. how will he earn for a job that from 11:30 a.m. to 2:00 p.m.?
Answer: $63
Step-by-step explanation:
If the electrician gains $18 an hour and works for 3 and a half hours, once you add the money for the total time up you will get $63.
$9 (for the 30 minutes) + $18 x 3 (for the 12-2 full working hours).
Hope this helps^^
[7th Grader]
10. (a) Find the value of 5°
5 is in hundreds place and its place value is 500, 4 is in tens place and its place value is 40, 8 is in ones place and its place value is 8.
I hope this helps :)
1 point
It took me 120 minutes to answer 25 questions. How long did each question take? type your answer...
Previous
minutes
It took me 120 minutes to answer 25 questions. How long did each question take?
120/25 = 4.8 minutes per question
Fine the average rate of change for f(x) on the interval [-1,3]
For any function f(x), the average rate of change on the interval [x1,x2] is given by [f(x2) - f(x1)]/(x2-x1)
For f(-1) = 2.5 and f(3) = 40, the average rate of change on the interval [-1,3] is given by:
step 1 - (40 - 2.5)/[3-(-1)] = 37.5/4 = 9.375
step 2 - (37.5)/4
step 3 - Solving the fraction we find that the average rate of change is 9.375 (or 75/8)
Please help i’ve been stuck on this question for a too long!!
Graph the function with the given description.
A linear function h models a relationship in which the dependent variable increases 1 unit for every 5 units the independent variable
decreases. The value of the function at 0 is 3.
The linear function equation exists the slope-intercept form. A linear equation exists represented as: h(x) = mx + b then [tex]$\mathbf{h}(\mathrm{x})=-\frac{1}{5} \mathrm{x}+3$\\[/tex].
What is meant by linear function?A linear equation is an algebraic equation of the form y=mx+b, where m is the slope and b is the y-intercept, and only a constant and a first-order (linear) term are included. The variables in the preceding equation are y and x, and it is occasionally referred to as a "linear equation of two variables."
Let the independent variable be x.
The value of the function at 0 is 3.
If h(0) = 3
When the independent variable decreases by 5, the independent variable increases by 1.
So, the slope (m) exists -1/5.
Where, m = -1/5 the slope
b = 3 - the y-intercept
A linear equation exists represented as: h(x) = mx + b then [tex]$\mathbf{h}(\mathrm{x})=-\frac{1}{5} \mathrm{x}+3$\\[/tex].
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(2x^2+3x+8) (x^2-x-4) multiply the polynomials and simplify the answer
Step-by-step explanation:
(2x² + 3x+8) (x²-x-4)
= (2x² + 3x+8) (x² +-x²+-4)
= (2x²) (x²) + (2x²) (-x) + (2x²) (-4) +(3x) (x²) + (3x) (-x) + (3x) (-4) + (8) (x²) + (8) (-x) + (8) (-4)
= 2x⁴ - 2x³ -8x² + 3x³ -3x² - 12x + 8x² - 8x - 32
=2x⁴ + x³ - 3x² - 20x - 32
Write the equation for g(x).
Answer: [tex]-\frac{x^2}{4}[/tex]
Step-by-step explanation:
The graph of g(x) is the graph of f(x) reflected over the x-axis and horizontally stretched by a factor of 2.
So, the equation is [tex]g(x)=-(x/2)^2 =-\frac{x^2}{4}[/tex]
need help 9th grade math
The slope-intercept form for this linear function is y = 8x + 47.
How to calculate the slope of a line?Mathematically, the slope of a straight line can be calculated by using this formula;
[tex]Slope,\;m = \frac{Change\;in\;y\;axis}{Change\;in\;x\;axis}\\\\Slope,\;m = \frac{y_2\;-\;y_1}{x_2\;-\;x_1}[/tex]
From the linear function, we have:
Points on x-axis = (-3, 2).
Points on y-axis = (23, -17).
Substituting the given points into the formula, we have;
Slope, m = (-17 - 23)/(2 + 3)
Slope, m = -40/5
Slope, m = -8
Mathematically, the slope-intercept form of a straight line is given by;
y = mx + c
Where:
x and y are the points.m represents the slope.c represents the intercept.At point (-3, 23), we have:
y = mx + c
23 = 8(-3) + c
23 = -24 + c
c = 23 + 24
c = 47
Therefore, the slope-intercept form is as follows:
y = mx + c
y = 8x + 47
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