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Step-by-step explanation:
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Thank You!
4) ƒ(x) = −x³ + 4x² − 2
These are the x-coordinates of the points where the graph intersects the x-axis. We can use these points to sketch the curve of the function.
What is equation?An equation is a mathematical statement that indicates the equality of two expressions. It consists of two expressions separated by an equal sign (=). The expression on the left side of the equal sign is equivalent to the expression on the right side. Equations can have one or more variables, which are usually represented by letters such as x, y, or z. The goal in solving an equation is to determine the value(s) of the variable(s) that make the equation true. This involves manipulating the expressions on both sides of the equal sign using algebraic operations such as addition, subtraction, multiplication, and division, to isolate the variable on one side of the equation. Equations are used in many areas of mathematics and science to represent relationships between variables and to solve problems. They are also used in various fields such as engineering, physics, and economics to model real-world situations and make predictions based on mathematical analysis.
Here,
The function ƒ(x) = −x³ + 4x² − 2 is a cubic function, which means that it is a polynomial of degree 3. The general form of a cubic function is:
ƒ(x) = ax³ + bx² + cx + d
where a, b, c, and d are constants. In the given function, we have:
a = -1
b = 4
c = 0
d = -2
Therefore, we can rewrite the function as:
ƒ(x) = -x³ + 4x² - 2
This function can be graphed to show the shape of the curve it creates. The graph of a cubic function is a curve that can either be concave up or concave down, depending on the sign of the leading coefficient. In this case, the leading coefficient is negative, so the graph will be concave down. The function has a y-intercept of -2, which means that it intersects the y-axis at the point (0, -2). To find the x-intercepts, we can set ƒ(x) equal to zero and solve for x:
ƒ(x) = -x³ + 4x² - 2 = 0
We can use factoring or the quadratic formula to solve for x, but in this case, the equation can be simplified by factoring out a common factor of x²:
-x²(x - 4) + 2 = 0
Now we can solve for x:
x² = 2/(4 - x)
x = ±√(2/(4 - x))
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Complete question:
Solve for x when ƒ(x) = −x³ + 4x² − 2.
PLEASE HELP ASAP
Question 4(Multiple Choice Worth 2 points)
(Line of Fit MC)
Data was collected on the amount of time that a random sample of 8 students spent studying for a test and the grades they earned on the test. A scatter plot and line of fit were created for the data.
scatter plot titled students' data, with points plotted at 1 comma 80, 2 comma 70, 2 comma 80, 2 comma 90, 3 comma 80, 3 comma 100, 4 comma 90, and 4 comma 98, and a line of fit drawn passing through the points 0 comma 70 and 1 comma 75
Find the y-intercept of the line of fit and explain its meaning in the context of the data.
80; a student who studies for 0 hours is predicted to earn 80% on the test
70; a student who studies for 0 hours is predicted to earn 70% on the test
10; for each additional hour a student studies, their grade is predicted to increase by 10% on the test
5; for each additional hour a student studies, their grade is predicted to increase by 5% on the test
The line of fit's y-intercept is 80. This suggests that a student's anticipated test grade is 80% if they don't study at all.
What exactly is a scatter plot?A scatter plot is a type of graph that illustrates data and the connection between two variables. With one variable plotted on the x-axis and the other variable drawn on the y-axis, each data point is represented by a point on the plot. Data analysis use scatter plots to find patterns and connections between variables.
The line of fit's y-intercept is 80. This suggests that a student's anticipated test grade is 80% if they don't study at all.
This indicates that studying is positively connected with test performance in the context of the data. Higher exam scores are anticipated for students who study more. The amount of time spent studying alone may not account for other elements that may potentially affect exam performance, such as prior knowledge or test-taking techniques.
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I recently took a review test and it talked about amount of error (percent error) . The question said that , “the estimate number of balls in each bag was 86. It turned out to be 104. What is the percent of error? Round to the nearest tenth.” I wrote 17.3%. The teacher said it was wrong and claimed that you had to divide it by expected, not real. (Formula is (expected-real)/real.)) Can someone help me out, am I wrong or the teacher?
The percent of error is 20.9302%. The solution has been obtained by using percent error.
What is percent error?
The difference between the estimated value and the actual value in respect to the actual value is known as the percent error.
We are given that the estimate number of balls in each bag was 86 but it turned out to be 104.
So, the percent error is
⇒Percent error = [Estimated Value - Actual value] / Actual value
⇒Percent error = [104 - 86] / 86
⇒Percent error = 18 / 86
⇒Percent error = 20.9302%
Hence, the percent of error is 20.9302%.
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No matter what the value of s, √s^2 is equal to the value of s.
The statement that √s^2 is equals to the value of s is false, as s² is an even function, hence √s^2 can be equal either to the value of s or to -s.
What are even and odd functions?In even functions, we have that the statement f(x) = f(-x) is true for all values of x.In odd functions, we have that the statement f(-x) = -f(x) is true for all values of x.If none of the above statements are true for all values of x, the function is neither even nor odd.The s² function is even, hence, for example:
sqrt[(-3)²] = sqrt(9) = 3.
Which proves by contradiction that the statement is false.
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5. Three similar steel bars of lengths 210 cm, 300 cm, 360 cm are cut into equal parts. Find
the smallest possible area of a square which can be made from the three pieces
The smallest possible area of a square which can be made from the three pieces is 11833.203125 cm².
What is the smallest possible area?To find the smallest possible area of a square, we need to make sure that we use the longest pieces to form the sides of the square. Therefore, we need to divide the 360 cm steel bar into equal parts first, then use the remaining parts to divide the other two steel bars.
Let's call the length of each part x.
The 360 cm steel bar can be divided into n parts of length x, where:
n = 360/x
Similarly, the 300 cm steel bar can be divided into m parts of length x, where:
m = 300/x
And the 210 cm steel bar can be divided into k parts of length x, where:
k = 210/x
To form a square, we need to use all the parts we cut from the steel bars. Therefore, the length of the sides of the square will be nx + mx + kx, which is equal to (n + m + k)x.
The area of the square will be (n + m + k)x²
To find the smallest possible area, we need to minimize (n + m + k)x². Since x can be any positive number, we can focus on minimizing n + m + k.
n + m + k = (360/x) + (300/x) + (210/x)
n + m + k = (870/x)
To minimize (n + m + k), we need to maximize x. However, x cannot be greater than the smallest steel bar, which is 210 cm long.
Therefore, x must be a factor of 210.
Let's try x = 1 cm. In this case, n + m + k = 870 cm, which means we can form a square with sides of length 870 cm/4 = 217.5 cm.
The area of this square is 217.5^2 = 47250.625 cm².
Let's try x = 2 cm. In this case, n + m + k = 435 cm, which means we can form a square with sides of length 435 cm/4 = 108.75 cm.
The area of this square is 108.75² = 11833.203125 cm².
Let's try x = 3 cm. In this case, n + m + k = 290 cm, which means we cannot form a square using all the parts we cut from the steel bars.
Therefore, the smallest possible area of a square which can be made from the three pieces is 11833.203125 cm², and this can be achieved by cutting the steel bars into parts of length 2 cm.
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If the rate of inflation is 3.4% per year, the future price p(t) (in dollars) of a certain item can be modeled by the following exponential function, where t is the number of years from today. p(t)=25000(1.034)^t. Find the current price of the item and the price 10 years from today.
The price of the item 10 years from today will be approximately $37,607.56
What is Algebraic expression ?
Algebraic expression can be defined as combination of variables and constants.
To find the current price of the item, we need to substitute t = 0 in the given equation.
So we get:
[tex]p(0) = 25000(1.034)^0 = 25000(1) = 25000[/tex]
Therefore, the current price of the item is $25,000.
To find the price 10 years from today, we need to substitute t = 10 in the given equation. So we get:
[tex]p(10) = 25000(1.034)^{10} = 37607.56[/tex]
Therefore, the price of the item 10 years from today will be approximately $37,607.56.
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Use long division to find each quotient.
(x³ - 3x² +5x + 3) ÷ (x + 1)
Answer: We will use long division to find the quotient of (x³ - 3x² + 5x + 3) ÷ (x + 1).
x² - 4x + 9
___________________
x + 1 | x³ - 3x² + 5x + 3
- (x³ + x²)
--------------
-4x² + 5x
-(-4x² - 4x)
------------
9x + 3
-(9x + 9)
-------
6
Therefore, the quotient of (x³ - 3x² + 5x + 3) ÷ (x + 1) is x² - 4x + 9 with a remainder of 6.
Step-by-step explanation:
Triangle JKL is an equilateral triangle with two of its vertices at points J and K. What are the coordinates of point L?
The coordinates of point L are (s/2, s√3/2). If we know the value of s, we can determine the specific coordinates of point L.
To determine the coordinates of point L in an equilateral triangle with vertices J and K, we first need to know the location of J and K.
Since the triangle is equilateral, the distance from J to K is the same as the distance from J to L or from K to L. Let's assume that the side length of the equilateral triangle is s. Then, the distance from J to K is also s. We can assume that J is located at the origin (0,0), and K is located at (s,0).
To find the coordinates of point L, we can use some trigonometry. Let's draw a line from point K to point L, and let the angle between this line and the x-axis be θ. Since the triangle is equilateral, this angle is 60 degrees.
The x-coordinate of point L is then given by s cos θ. Since cos 60 = 1/2, the x-coordinate of point L is s/2.
The y-coordinate of point L is given by s sin θ. Since sin 60 = √3/2, the y-coordinate of point L is s√3/2.
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Starts work at 7:30 a.m. and finish at 4:30 p.m. he has a 45-minute lunch break how many hours does he work in a normal 5-day week
Answer: 41 hours and 15 minutes
Step-by-step explanation:
First, we count the time duration from 7:30am to 4:30pm, which is 9 hours.
Next, we subtract 45 minutes from 9 hours, which equals 8 hours and 15 minutes.
Last, we multiply that by 5 which equals 41 hours and 15 minutes.
QUESTION 6 Suppose a researcher has collected the GPAS (y variable) and Hours of Studying per week (x-variable) for 100 students. What GPA will the regression equation try to predict for students who study 10 hours per week? (NOTE: Do not use the regression equation to answer this question. The answer is not a number.) TTTT Paragraph Arial 3 (12pt) 3. T. QI %DO QE 3 TT, $x Mashup. TH
A researcher will use a regression equation to predict the relationship between the GPAS (y variable) and Hours of Studying per week (x-variable) for 100 students. The regression equation will try to predict the GPA for students who study 10 hours per week by estimating the relationship between the two variables. The regression equation is a mathematical model that is used to predict the value of one variable based on the value of another variable.
In this case, the regression equation will try to predict the GPA for students who study 10 hours per week based on the relationship between GPAS and Hours of Studying per week.
The goal of the regression equation is to provide an accurate prediction of the GPA for students who study 10 hours per week, based on the data collected by the researcher.
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Given: ( q is number of items ) Demand function: d(q)=562.5-0.4q^(2) Supply function: s(q)=0.5q^(2)
The equilibrium quantity of items is 25.
The question is asking for the equilibrium quantity of items when the demand and supply functions given are graphed together. The equilibrium quantity can be found by solving for q when the demand and supply functions are equal.
Demand: d(q) = 562.5 - 0.4q2
Supply: s(q) = 0.5q2
Set the demand and supply functions equal to each other and solve for q:
562.5 - 0.4q2 = 0.5q2
0.9q2 = 562.5
q2 = 625
q = 25
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Mr Johns is buying a new phone. He wants to pay for the phone in 12 equal monthly payments. Work out how much Mr Johns will pay each month.
Gr8 Phones
Normal price £780
Sale price 5% off
Answer:
56.14
Step-by-step explanation:
673.36/12
Mei and Ming both improved their yards by planting rose bushes and ivy they bought their supplies from the same store Mei spent 36 on 3 rose bushes and 1 pot of ivy Ming spent 168 on 9 rose bushes and 8 pots of ivy what's the cost of one rose bush and one pot of ivy..
Answer:
Mei and Ming both improved their yards by planting rose bushes and ivy they bought from the same store. Mei spent $36 on 3 rose bushes and 1 pot of ivy, while Ming spent $168 on 9 rose bushes and 8 pots of ivy. The cost of one rose bush and one pot of ivy would be $21, since the cost of one rose bush is $7 and one pot of ivy is $14
Step-by-step explanation:
A bank account has a monthly interest rate of 1% and initial balance of $1,000. Any earned interest is added to the account and no other deposits or withdrawals are made.
What is the account balance after 3 months. Round to the nearest dollar.
Answer: 1030.301 rounded is $1,030
Step-by-step explanation:
1000(1+.01)^3=1030.301
You multiply your initial amount by 1 and add your percent after you convert it to a decimal by moving your point two paces to the left. If you're withdrawing, you subtract your decimal. Everything is them raised to the power of 3. You then can multiply it on paper, my teacher lets us use calculators though to ensure we don't get an incorrect answer.
A 6-foot person standing 18 feet from a streetlight casts a 10-foot shadow. Two similar triangles are formed. One triangle is formed by the person and the shadow that the person casts. A second triangle is formed by the streetlight and the ground from the base of the streetlight to the end of the shadow.
The streetlight is approximately 16.41 feet tall, and the length of its shadow is approximately 27.35 feet.
What is the proportion?
A proportion is a statement that two ratios are equal. In other words, a proportion is an equation that shows that two fractions or two ratios are equivalent. A proportion can be written in the form of:
a/b = c/d
We can use the properties of similar triangles to solve this problem. Let's call the height of the streetlight h, and the length of the shadow cast by the streetlight x. We can set up the following proportion:
(height of person) / (length of person's shadow) = (height of streetlight) / (length of streetlight's shadow)
or
6 / 10 = h / x
Simplifying this proportion, we get:
x = (10h) / 6
We also know that the person is standing 18 feet from the streetlight, and that the length of the person's shadow is 10 feet. Using the Pythagorean theorem, we can set up the following equation:
6^2 + 10^2 = (18 + x)^2
Simplifying and substituting x, we get:
36 + 100 = (18 + (10h/6))^2
136 = (18 + (10h/6))^2
Taking the square root of both sides, we get:
√136 = 18 + (10h/6)
Simplifying, we get:
√136 - 18 = (10h/6)
Multiplying both sides by 6, we get:
6(√136 - 18) = 10h
Simplifying, we get:
h ≈ 16.41 feet
Now, we can substitute this value of h into the expression for x that we derived earlier:
x = (10h) / 6 ≈ 27.35 feet
Therefore, the streetlight is approximately 16.41 feet tall, and the length of its shadow is approximately 27.35 feet.
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B it's 1/2 /8 /10 and d its 2, /2 /4
Emma Koonce Solve by Trinomial Factor (a)=(1) Feb 22, 8:36:18 AM Solve the quadratic by factoring. x^(2)=2x+8 Answer: x
The solutions to the quadratic equation x^(2)=2x+8 are x=4 and x=-2.
To solve the quadratic equation x^(2)=2x+8 by factoring, we need to rearrange the equation to make it equal to zero and then factor the trinomial.
Step 1: Rearrange the equation to make it equal to zero.
x^(2)-2x-8=0
Step 2: Factor the trinomial using the "AC Method."
The "AC Method" involves finding two numbers that multiply to the product of the coefficient of the x^(2) term (a) and the constant term (c), and add to the coefficient of the x term (b).
In this case, a=1, b=-2, and c=-8.
The product of a and c is (1)(-8)=-8.
The two numbers that multiply to -8 and add to -2 are -4 and 2.
Step 3: Rewrite the equation using the two numbers found in Step 2.
x^(2)-4x+2x-8=0
Step 4: Factor by grouping.
(x^(2)-4x)+(2x-8)=0
x(x-4)+2(x-4)=0
Step 5: Factor out the common factor (x-4).
(x-4)(x+2)=0
Step 6: Set each factor equal to zero and solve for x.
x-4=0 or x+2=0
x=4 or x=-2
Therefore, the solutions to the quadratic equation x^(2)=2x+8 are x=4 and x=-2.
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list the possible rational roots of P(x) given by the rational roots theorem for P(x)=3x^3-4x^3-x^2-7
The possible rational roots of P(x).
According to the Rational Root Theorem, the possible rational roots of P(x) are the fractions ±p/q, where p is a factor of the constant term (-7) and q is a factor of the leading coefficient (3). The possible values for p are ±1 and ±7, and the possible values for q are ±1 and ±3. Therefore, the possible rational roots of P(x) are:
±1/1 = ±1
±7/1 = ±7
±1/3 = ±1/3
±7/3 = ±7/3
So, the possible rational roots of P(x) are ±1, ±7, ±1/3, and ±7/3.
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how do i answer that?!
Answer:
the answer is 4.
Step-by-step explanation:
-3 squared will give you 9. 73- 9 is 64 and cube root of 64 is 4
Value added tax is added at 15% for goods and services In South Africa. What will be the selling of a laptop that costs R4200 before VAT
If the VAT in South Africa is 15%, then selling price of the laptop after the VAT is R4830 .
The cost price of the laptop before the VAT is R4200,
The VAT percent on goods and services is = 15%,
In order to calculate the selling price of the laptop that costs R4200 before VAT is added at 15% in South Africa, we can use the following formula:
⇒ Selling Price = Cost Price + (Cost Price × VAT )
Substituting the values,
We get,
⇒ Selling Price = R4200 + (R4200 × 0.15)
⇒ Selling Price = R4200 + R630
⇒ Selling Price = R4830
Therefore, the selling price of the laptop, including 15% VAT, will be R4830.
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Find the measure of angle E.
Answer:
m∠E = 57º
Step-by-step explanation:
We can use the isosceles triangle theorem to determine that angle E is congruent to angle D, since side DF is congruent to side EF.
This means that:
m∠E = m∠D
m∠E = (4x + 1)º
Now, we can solve for x using the fact that the interior angles of a triangle sum to 180º.
m∠D + m∠E + m∠F = 180º
↓ substituting the given angles measures (in terms of x)
(4x + 1)º + (4x + 1)º + (5x - 4)º = 180º
↓ grouping like terms
(4x + 4x + 5x)º + (1 + 1 - 4)º = 180º
↓ combining like terms
13xº - 2º = 180º
↓ adding 2º to both sides
13xº = 182º
↓ dividing both sides by 13º
x = 14
With this x value, we can now solve for m∠E using its definition in terms of x.
m∠E = (4x + 1)º
↓ plugging in solved x value
m∠E = (4(14) + 1)º
m∠E = (56 + 1)º
m∠E = 57º
A pan from the oven is sitting out to cool to room temperature. If the temperature difference between the pan and room temperature is currently 174°C and is decreasing by 5% every minute, how much above room temperature will the pan be in 21 minutes?
Answer: 59.26°
Step-by-step explanation:
Use the equation 174(0.95)^21
The 174 represents the temperature difference
The 21 represents the amount of time (in minutes) that has passed
To get 0.95, because the temperature is decreasing, you subtract
1-0.05=0.95 (0.05 and not 5 because you move the decimal over two places when working with percents)
That's the standard equation that you use when solving questions like these, and when you solve this equation you should get 59.26° (you need a calculator to solve it all at once)
Fatoumata kicks a football. Its height in feet is given by ℎ ( � ) = − 16 � 2 + 96 � h(t)=−16t 2 +96t where � t represents the time in seconds after kick. What is the appropriate domain for this situation?
For the given equation of the height the appropriate domain for this situation is 0 ≤ t ≤ 6.
What role does the domain play?The collection of all feasible input values that are appropriate for the circumstance being represented is known as the domain. In this instance, the domain stands for the range of time values relevant to the height of the football following a kick. The domain helps to avoid absurd or impossible outcomes by ensuring that the function is only evaluated for legitimate inputs.
The ball with follow a parabolic path, thus the maximum height is attained at:
t = -b/2a
Substituting the values we have:
t = -96/(-32) = 3 seconds.
The ball will then follow the downward path and will take an additional 3 seconds to reach the ground.
Thus, the total time taken will be 3 + 3 = 6 seconds.
Also, the ball initially starts from rest at 0 seconds.
Hence, the domain of the situation will be represented as 0 ≤ t ≤ 6.
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Which ordered pair is NOT a solution of y > 3x + 4? Responses (2, 12) (2, 12) (0, 5) (0, 5) (–2, 1) (–2, 1) (1, 7)
The ordered pair that is NOT a solution of y > 3x + 4 is (-2, 1). Hence, the answer is (E) (-2, 1).
What is inequality?A relationship between two expressions or values that are not equal to each other is called 'inequality. ' So, a lack of balance results in inequality.
The given inequality is y > 3x + 4. To check which ordered pair is not a solution of this inequality, we need to substitute the values of x and y from each ordered pair into the inequality and check whether the inequality holds or not.
Checking the ordered pairs one by one, we have:
(2, 12): y = 12 and x = 2, so 12 > 3(2) + 4 is true. Therefore, (2, 12) is a solution of the inequality.
(0, 5): y = 5 and x = 0, so 5 > 3(0) + 4 is true. Therefore, (0, 5) is a solution of the inequality.
(-2, 1): y = 1 and x = -2, so 1 > 3(-2) + 4 is false. Therefore, (-2, 1) is not a solution of the inequality.
(1, 7): y = 7 and x = 1, so 7 > 3(1) + 4 is true. Therefore, (1, 7) is a solution of the inequality.
Therefore, the ordered pair that is NOT a solution of y > 3x + 4 is (-2, 1). Hence, the answer is (E) (-2, 1).
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I NEED HELPP ASAP!!!!!!!!!!!!!!!!!
The measure of center that would best summarize the plot is given as follows: Median of 11.
The measure of variability is given as follows: IQR of 1.5.
What does a box-and-whisker plot shows?A box and whisker plots shows these five features from a data-set, listed as follows:
The minimum non-outlier value.The 25th percentile, which is the median of the bottom 50%.The median, which splits the entire data-set into two halfs, the bottom 50% and the upper 50%.The 75th percentile, which is the median of the upper 50%.The maximum non-outlier value.From the plot, these features are given as follows:
Minimum non-outliter value of 6.Q1 of 10.Median of 11.Q2 of 11.5.Maximum non-outlier value of 16.The median is the best measure of center of the data-set.
There is an outlier at 16, hence the best measure of variability is the IQR, given by the difference between the Q3 and the Q1, hence:
IQR = 11.5 - 10
IQR = 1.5.
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please help me i need your help. find the value of x
Answer:
122
Step-by-step explanation:
add the 2 angles together and there's your answer.
if you want to check take your answer and subtract from 180.
Answer: 122
Step-by-step explanation:
all triangles add up to 180
54+68=122
180-122=58
58=inner corner
180 (this is the measure of the line) -58 =122
hopefully this helps :))
There are 25 children in the preschool class. 100% of the children are served breakfast and lunch. Find the number of children who are served both meals.
Since 100% of the children are served both meals, this means that all 25 children are served both meals. Therefore, the answer is 25 children.
Find the number of childrenTo find the number of children who are served both meals, we can use the following formula:
Number of children served both meals = (percentage of children served both meals / 100) x total number of children
Plugging in the given values, we get:
Number of children served both meals = (100 / 100) x 25
Number of children served both meals = 1 x 25
Number of children served both meals = 25
Therefore, the number of children who are served both meals is 25. .
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mother is 40 years old and her daughter 12 years old. how many years is mother at least 3 times as old as her daughter. By using inequalities
Using inequality, the daughter's age to her mother's is 12x < 40.
What is inequality?Inequality is a mathematical statement that two algebraic expressions are unequal.
Inequalities are depicted as:
Greater than (>)Less than (<)Greater than or equal to (≥)Less than or equal to (≤)Not equal to (≠).The age of the mother = 40
The age of the daughter = 12
The number of times the mother's age is to her daughters = 3.33 times (40/12).
Let the number of times the mother's age is more than her daughter's age = x
Inequality:40 > 12x
or 12x < 40
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twelve basketball teams will play in a tournament. Four will be given byes in the first round. They will be matched against the four first-round winners from the other eight teams. How many games will a team have to win in ordet to win the tournament
Find the area of the triangle, to the nearest tenth, of the triangle with a = 3, b = 5, and c = 6
Area of the triangle ≈ 7.5 (to the nearest tenth).
To find the area of the triangle given its side lengths, we will use Heron's formula:
s =(a + b + c)/2
A = sqrt(s(s-a)(s-b)(s-c))
where s is the semiperimeter of the triangle, and A is the area of the triangle.
For the given triangle, we have:
a = 3
b = 5
c = 6
The semiperimeter s can be calculated as:
s = (a + b + c) / 2 = (3 + 5 + 6) / 2 = 7
Using this value of s, we can apply Heron's formula to find the area A:
A = √(s(s-a)(s-b)(s-c))
= √(7(7-3)(7-5)(7-6))
≈ 7.48
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