Answer:
x = -3
Step-by-step explanation:
simplify
3(x - 4) = -21
3x - 12 = -21
3x = = -9
x = -3
Dean ran 2.3 fewer kilometers than Sam. If Dean ran 6.8 km, how far did Sam run?
A 2-column table with 4 rows. Column 1 is labeled Situation with entries increasing, difference, finding part of a total, sharing or grouping. Column 2 is labeled Operation with entries +, minus, times, divided by.
Select all that apply.
You know the difference in the distances the boys ran, so this is a subtraction problem.
You are finding the total distance the boys ran, so this is an addition problem.
Dean ran part of the distance Sam ran, so this is a multiplication problem.
The correct equation is s + 2.3 = 6.8.
The correct equation is s – 2.3 = 6.8.
The correct equation is 2.3s = 6.8.
Answer:
the first and 5th
Step-by-step explanation:
this is right
a) The difference in the distances the boys ran, so this is a subtraction problem
d) The equation is s - 2.3 = 6.8
What do you mean by an Equation?Equations are statements in mathematics that have two algebraic expressions on either side of the equals (=) sign.
It displays the similarity of the connections between the phrases on the left and right sides.
Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are examples of the parts of an equation. When creating an equation, the "=" symbol and terms on both sides are necessary.
Given data ,
Let the distance ran be Dean be represented as d
Let the distance ran be Sam be represented as s
And , Dean ran 2.3 fewer kilometers than Sam
So , difference in the distances the boys ran, so this is a subtraction problem
On simplifying , we get
s - 2.3 = d be equation (1)
And , when d = 6.8 km
s - 2.3 = 6.8
Adding 2.3 km on both sides of the equation , we get
s = 9.1 km
Therefore , the value of s is 9.1 km
Hence , the distance ran be Sam is 9.1 km
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A persons muscle mass changes with age. Muscle mass increases into young adulthood and decreases after. Which is the dependent variable in this relationship?
The dependent variable is muscle mass.
Explanation:The dependent variable in this relationship is muscle mass.
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John inherited $5,000 from his grandfather. He put it in a savings account to buy a car when he turns 16. John is 13 right now. If his savings account earns 7% over the next 3 years, how much interest will he have earned?
Answer:
Step-by-step explanation:
$
1050
Explanation:
To calculate interest the formula is :
P
r
t
=
i
where P= Principle, r=rate as a decimal, t+ time in years.
(assuming simple interest)
P
r
t
=
i
5000
⋅
0.07
⋅
3
=
i
i
=
$
1050
Answer:
1050
Step-by-step explanation:
Can 12,18,30 be a right triangle
Answer:
no
Step-by-step explanation:
A set of three integers that can be the lengths of the sides of a right triangle is called a Pythagorean triple. The simplest Pythagorean triple is the set “3, 4, 5.” These numbers are the lengths of the sides of a “3-4-5” Pythagorean right triangle. The list below contains all of the Pythagorean triples in which no number is greater than 50.
3, 4, 5
5, 12, 13 6, 8, 10
7, 24, 25 8, 15, 17 9, 12, 15 9, 40, 41 10, 24, 26 12, 16, 20 12, 35, 37
14, 48, 50 15, 20, 25 15, 36, 39 16, 30, 34 18, 24, 30 20, 21, 29 21, 28, 35 24, 32, 40 27, 36, 45 30, 40, 50
Example Problems
Find the length of the missing side.
13 25 x7
12 x
From the list above, the missing From the list above, the missing side is “5” side is “24”
Show why the set “6,8,10” is a Pythagorean triple.
c2 = a2 + b2 102 =82 +62 100 = 64 + 36 100 = 100
Since the Pythagorean equation is satisfied, the set “6,8,10” is a Pythagorean triple.
Answer:
NO.
Step-by-step explanation:
By the Pythagoras theorem if 30^2 = 12^2 + 18^2 it is a right triangle.
30^2 = 900
12^2 = 144
18^2 = 324
Adding 12^2 + 18^2 = 468 so the answer is no.
Plz help! Question in picture. What is the slope?
Answer:
7
Step-by-step explanation:
To find the slop, use (rise/run)
The y goes from 0 to 7/3
The x goes from 0 to 1/3
This means it would be (7/3)/(1/3)
This equals 7 as when you divide fractions, the second fraction goes to its reciprocal and you multiply
7/3 * 3/1
You can eliminate both 3 leaving you with 7/1 which is 7
Laura deposited $4,000 in her new bank account. The bank pays 7.25% simple interest every year. What will be the balance of her account at the end of 3 years, if she make no additional deposits or withdrawals?
Answer:
The balance of Laura's account at the end of 3 years will be $4,870.
Step-by-step explanation:
Formula of simple interest:
[tex]I[/tex]=Prt
[tex]I[/tex] = simple interest
P= Principal
r = rate of interest
t= time in year.
Amount after t years (A)= P+[tex]I[/tex].
Given that,
Laura deposits $4,000 at a rate 7.25% simple interest.
Here, P=$4,000, r=7.25%= 0.0725, t=3 years
[tex]I[/tex]=Prt
=$(4,000×0.0725×3)
=$870
The balance of Laura's account at the end of 3 years will be =$(4,000+870)
=$4,870
When constructing a circumcircle of a right triangle, Hunter said that the diameter of the circle will be the hypotenuse of the triangle. Daniel said the circumcenter would be located inside the triangle and they hypotenuse would just be a chord, not the diameter? Who is correct?
Answer:
hunter
Step-by-step explanation:
Final answer:
Hunter is correct that the hypotenuse of a right triangle acts as the diameter of its circumcircle, with the circumcenter located at the midpoint of the hypotenuse.
Explanation:
When constructing a circumcircle of a right triangle, Hunter's assertion is correct. According to a well-known theorem, the hypotenuse of a right triangle will be the diameter of the circumcircle that can be drawn around the triangle. This is because the center of the circumcircle, known as the circumcenter, is equidistant from all vertices of the triangle, and for a right triangle, this point is the midpoint of the hypotenuse.
Since the circumcenter is the midpoint of the hypotenuse, and the hypotenuse is the longest side of a right triangle, it will also serve as the diameter of the circumcircle. The radius of the circle, therefore, extends from this midpoint to any of the triangle’s vertices. Daniel's statement that the circumcenter would be located inside the triangle is incorrect for a right triangle, though it might be true for acute or obtuse triangles.
Spencer made a quilt for his cousin's doll. The quilt had a 7x7 array of different color square patches. If each patch is 1 3/4 in long, what is the area of the whole quilt?
To calculate the area of Spencer's 7x7 quilt, each square patch measuring 1 3/4 inches is calculated for area (3.0625 sq. in.) and then multiplied by the total number of patches (49), resulting in a total quilt area of 150.0625 square inches.
Explanation:Spencer made a quilt for his cousin's doll with a 7x7 array of square patches. To find the area of the whole quilt, we need to calculate the area of one patch and then multiply by the total number of patches. The length of each patch is 1 3/4 inches, which can also be represented as 1.75 inches.
First, we find the area of one patch:
Area of one patch = side length × side lengthArea of one patch = 1.75 inches × 1.75 inchesArea of one patch = 3.0625 square inchesSince there are 49 patches in total (7 patches per row × 7 rows), we then find the total area:
Total area = area of one patch × total number of patchesTotal area = 3.0625 square inches × 49Total area = 150.0625 square inchesTherefore, the area of Spencer's quilt is 150.0625 square inches.
Final answer:
The area of Spencer's quilt is 150.0625 square inches.
Explanation:
Spencer made a quilt for his cousin's doll that had a 7x7 array of square patches, each measuring 1 3/4 inches in length. To find the area of the quilt, you would calculate the area of one patch and then multiply it by the total number of patches in the quilt.
First, convert the inches to a decimal to make the calculation easier:
1 3/4 inches = 1.75 inchesArea of one square patch = length × width
Since the patches are square, the length and width are the same:
Area of one patch = 1.75 inches × 1.75 inches = 3.0625 square inches
To find the total area of the quilt:
Total area of quilt = area of one patch × number of patches
There are 7 rows and 7 columns in the quilt:
Total patches = 7 × 7 = 49
Total area of quilt = 3.0625 square inches × 49 = 150.0625 square inches
Therefore, the area of the whole quilt is 150.0625 square inches.
From a class of twenty students, how many different ways can the 1 , 2 , and 3rd students be chosen?
Answer:
They can be chosen in 6,840 different ways
Step-by-step explanation:
In this question, we are tasked with calculating the number of ways in which the 1st, 2nd and 3rd students can be chosen.
For the first position, we have 20 people vying for the position and we are to select only one for the position.
The number of ways this is achievable is 20C1 ways = 20 ways
For the second position, we are left with 19 students vying for the position and we are to select only one for the position. The number of ways this is possible is 19C1 ways = 19 ways
For the third position, we are left with 18 students vying for the position. The number of ways this is possible is 18C1 ways = 18 ways
Thus, the total number of ways this cane be done is; 20 ×19 ×18 = 6,840 ways
The profits of a company are found by subtracting the company's costs from its revenue. If a company's cost can be modeled by 14x-0.0002xsquared, what is an expression for the profit
An expression for the profit of the company is 26x - 0.0002x^2 - 120,000.
To find the expression for the profit of a company, we need to subtract the cost from the revenue.
The cost of the company is given by the expression 14x + 120,000, where x represents the quantity of the product being produced or sold.
The revenue of the company is given by the expression 40x - 0.0002x^2, where x represents the quantity of the product being produced or sold.
To find the profit, we subtract the cost from the revenue:
Profit = Revenue - Cost
Profit = (40x - 0.0002x^2) - (14x + 120,000)
To simplify the expression, we distribute the negative sign:
Profit = 40x - 0.0002x^2 - 14x - 120,000
Combining like terms:
Profit = (40x - 14x) - 0.0002x^2 - 120,000
Simplifying further:
Profit = 26x - 0.0002x^2 - 120,000
Therefore, an expression for the profit of the company is 26x - 0.0002x^2 - 120,000.
Final answer:
The profit of a company is the difference between its total revenue and costs, and can be calculated using the formula P = R - (14x - 0.0002x²), where P is profit, R is revenue, and x is the number of units.
Explanation:
To calculate the expression for the profit of the company, we need to find the difference between the total revenue and the total cost.
Given the cost can be modeled by 14x - 0.0002x2, and assuming the revenue is R, the profit P can be represented as:
P = R - (14x - 0.0002x²)
If we are given a specific value for the revenue, we would substitute it in place of R to find an explicit expression for P. For instance, if the revenue is $200,000, the profit formula would be:
P = $200,000 - (14x - 0.0002x²)
It's important to note that the profit decreases as the cost increases, and when costs exceed revenue, the company experiences a loss.
The average yearly Medicare hospital insurance benefit per person was $4064 in a recent year. Suppose the benefits are normally distributed with a standard deviation of $460. Round the final answers to four decimal places and intermediate Z value calculations to two decimal places.
To find the probability that the mean benefit for a random sample of 25 patients is less than $3920, we calculate the z-score and use the z-table to find the probability. The probability is approximately 0.0749, or 7.49%.
To find the probability that the mean benefit for a random sample of 25 patients is more than $4230, we follow the same steps and find that the probability is approximately 0.0179, or 1.79%.
To find the probability that the mean benefit for a random sample of 25 patients is less than $3920, we need to use the standard deviation and the sample size. The formula we'll use is:
Z = (X - μ) / (σ / sqrt(n))
Where Z is the z-score, X is the value we're interested in, μ is the mean, σ is the standard deviation, and n is the sample size.
First, let's calculate the z-score:Z = (3920 - 4064) / (460 / sqrt(25))
Z = -1.44
Next, we'll look up the z-score in the z-table to find the probability:P(X < 3920) = P(Z < -1.44)
Using the z-table, we find that the probability is approximately 0.0749, or 7.49%.For the second part of the question, we want to find the probability that the mean benefit for a random sample of 25 patients is more than $4230. We can use the same formula:Z = (4230 - 4064) / (460 / sqrt(25))
Z = 2.13
P(X > 4230) = P(Z > 2.13)
Using the z-table, we find that the probability is approximately 0.0179, or 1.79%.
The probable question may be:
The average yearly Medicare hospital insurance benefit per person was $4064 in a recent year. Suppose the benefits are normally distributed with a standard deviation of $460. Round the final answers to four decimal places and intermediate Z value calculations to two decimal places.
Find the probability that the mean benefit for a random sample of 25 patients is less than $3920
P(X <3920) =
Find the probability that the mean benefit for a random sample of 25 patients is more than $4230
P (X> 4230) =
Average yearly Medicare hospital insurance benefits below $4500: z-score ≈ 0.95, probability ≈ 0.8289. About 82.89% benefits fall below this threshold.
let's break down the steps to solve this problem:
Given:
- Average yearly Medicare hospital insurance benefit [tex](\( \mu \))[/tex] = $4064
- Standard deviation[tex](\( \sigma \))[/tex] = $460
We are asked to find the probability of Medicare hospital insurance benefits being below a certain value, which requires calculating the z-score.
Step 1: Calculate the z-scoreThe z-score formula is given by:
[tex]\[ z = \frac{{X - \mu}}{{\sigma}} \][/tex]
Where:
- ( X ) is the value we want to find the probability for,
[tex]- \( \mu \)[/tex] is the mean,
[tex]- \( \sigma \)[/tex] is the standard deviation.
Let's say we want to find the probability for Medicare hospital insurance benefits below $4500. Substituting the values into the formula:
[tex]\[ z = \frac{{4500 - 4064}}{{460}} \][/tex]
[tex]\[ z = \frac{{436}}{{460}} \][/tex]
[tex]\[ z \approx 0.95 \][/tex]
Step 2: Find the probability using the standard normal distribution tableNow, we need to find the probability corresponding to the z-score we calculated. We can use a standard normal distribution table or a calculator for this purpose. The z-score of 0.95 corresponds to a probability of approximately 0.8289.
Step 3: InterpretationThis means that approximately 82.89% of Medicare hospital insurance benefits are below $4500.
Final AnswerThe probability of Medicare hospital insurance benefits being below $4500 is approximately 0.8289 or 82.89%.
Garcia has 2 button collections. One has 321 buttons in it. The other has 704 buttons. She wants to divide them evenly among 5 of her friends. How many buttons will each friend receive?
Answer: 205 buttons
Step-by-step explanation:
Garcia has 2 button collections. One has 321 buttons in it. The other has 704 buttons. The total button collection will be:
= 321 + 704 = 1025
Since she wants to divide it equally among 5 friends, we divide 1025 by 5. This will be:
= 1025 ÷ 5
= 205
Each friend will get 205 buttons.
Answer:
Each friend will receive 205 buttons
Step-by-step explanation:
In this question, we are tasked with calculating the number of buttons each of 5 Garcia's friend will receive
Firstly, we will need to find the total number of buttons available
That would be 321 + 704 = 1025 buttons
Now to find the distribution per friend, we simply divider the total by 5
That would be 1025 buttons ÷ 5 = 205 buttons
This means that each of the five friends will receive 205 buttons each
Hurryyy
Which angle is an exterior angle of the triangle?
Answer: Four is the exterior angle.
Step-by-step explanation:
How much more would you earn in the first investment than in the second investment? $22 comma 000 invested for 30 years at 12% compounded annually $22 comma 000 invested for 30 years at 6% compounded annually You would earn $ nothing more on the first investment than in the second investment. (Round to the nearest dollar as needed.)
Answer:
Therefore I would earn $532,761 more on the first investment than in the second investment.
Step-by-step explanation:
The formula of compound interest
[tex]A=P(1+r)^n[/tex]
Compound interest [tex]I=A-P[/tex]
A= Amount after n years
P= Principal
r=Rate of interest
n= Number of years
First investment,
P₁=$22,000, r=12%=0.12 and n=30 years
[tex]A_1= 22,000(1+0.12)^{30}[/tex]
=659,118.28
≈$659,118
[tex]I_1[/tex]= [tex]A_1[/tex]-P₁
=$(659,118-22,000)
=$637,118
Second investment,
P₂=$22,000, r=6%=0.06 and n=30 years
[tex]A_1= 22,000(1+0.06)^{30}[/tex]
=126,356.81
≈$126,357
[tex]I_2[/tex]= [tex]A_2[/tex]-P₂
=$(126,357-22,000)
=$104357
[tex]I_1-I_2[/tex]
=$(637,118-104,357)
=$532,761
Therefore I would earn $532,761 more on the first investment than in the second investment.
In a state lottery, 28 balls are numbered 1-28. Eight of them are randomly selected without replacement. To win, you only need to match the eight numbers drawn. Calculate the probability of winning this lottery if you purchase one ticket.
Answer:
2/7
Step-by-step explanation:
Each time you play, you get 1 number. Since 8/28 numbers win, you have a 8/28 chance to win if you buy one ticket. 8/28 = 2/7
The circumference of a circle is 22π cm, what is the radius of the circle?
Answer:
11
Step-by-step explanation:
Formula for finding a circumference = [tex]2\pi r[/tex]
You are given the circumference which is [tex]22\pi[/tex]
[tex]22\pi =2\pi r[/tex]
So you divide both sides by [tex]2\pi[/tex] and [tex]\pi[/tex] cancels out
[tex]\frac{22\pi }{2\pi } =\frac{2\pi }{2\pi } *r[/tex]
r=11
Answer:
11
Step-by-step explanation:
Please help I really need this
Answer:
113.1
Step-by-step explanation:
V=[tex]\frac{4}{3}[/tex]πr³
(-30) - (+40) = (-30) + (-40) explain why this is true
Answer:
This is true because negative and positive is positive that why there is a addition sign in the middle and positive 40 becomes negative
Step-by-step explanation:
The temperature increases from 18 F to 27 F. What is the percent increase of the temperature ?
Answer:
Step-by-step explanation:
This is an increase of 9
Or, as a percentage (rounded to two decimal places):
an increase of 50%
The area of the Florida Keys National Marine Sanctuary is about 9600 square kilometers. The area of the Florida Reef Tract is about 16.2% of the area of the sanctuary. What is the area of the Florida Reef Tract? Write your answer in scientific notation.
Answer:
the answer is 1,555.2
Step-by-step explanation:
Answer:1.5552x10 cubed
Step-by-step explanation:
Tina, Sijil, Kia, vinayash Alisha and shifa are playing game by forming two teams. Three players in each team how many different ways can they be put into two teams of three players
Answer:
[tex]20[/tex]
Step-by-step explanation:
GIVEN: Tina, Sijil, Kia, vinayash Alisha and shifa are playing game by forming two teams Three players in each team.
TO FIND: how many different ways can they be put into two teams of three players.
SOLUTION:
Total number of players [tex]=6[/tex]
total teams to be formed [tex]=2[/tex]
total players in one team [tex]=3[/tex]
we have to number of ways of selecting [tex]3[/tex] players for one team, rest [tex]3[/tex] will go in other team.
Total number of ways of selecting [tex]3[/tex] players [tex]=^6C_3[/tex]
[tex]=\frac{6!}{3!3!}[/tex]
[tex]=20[/tex]
Hence total number of different ways in which they can be put into two different teams is [tex]6[/tex]
Solving for a missing side.
Find the missing side. Round to the nearest tenth. Please show the work. Part 1
Answer:
1. 26.6
2. 12.3
3. 23.3
4. 10.9
Step-by-step explanation:
1. tan(31) = 16/x
x = 16/tan(31)
x = 26.62847172
2. sin(43) = x/18
x = 18sin(43)
x = 12.27597048
3. cos(53) = 14/x
x = 14/cos(53)
x = 23.26296198
4. cos(33) = x/13
x = 13cos(33)
x = 10.90271738
Answer:
1. 26.6 units
2. 12.3 units
3. 23.3 units
4. 10.9 units
Step-by-step explanation:
1. We have the opposite and adjacent sides here for angle 31 degrees. So we need to use tangent, which is opposite / adjacent:
[tex]tan(31)=16/x[/tex]
[tex]x=16/(tan(31))[/tex] ≈ 26.6 units
2. We have the opposite and hypotenuse sides here for angle 43 degrees. So we need to use sine, which is opposite / hypotenuse:
[tex]sin(43)=x/18[/tex]
[tex]x=18*sin(43)[/tex] ≈ 12.3 units
3. We have the adjacent and hypotenuse sides here for angle 53 degrees. So we need to use cosine, which is adjacent / hypotenuse:
[tex]cos(53)=14/x[/tex]
[tex]x=14/(cos(53))[/tex] ≈ 23.3 units
4. We have the adjacent and hypotenuse sides here for angle 33 degrees. So we need to use cosine, which is adjacent / hypotenuse:
[tex]cos(33)=x/13[/tex]
[tex]x=13*cos(33)[/tex] ≈ 10.9 units
Hope this helps!
5. Five more than twice a number m is fifteen
Answer: 2m+5=15
Step-by-step explanation:
Answer:
5
Step-by-step explanation:
2x+5=15 can represent this situation. 15-5=10... 10/2= 5
Maria has a metal candleholder, without a top, that has a height of 3 cm and a radius of 3 cm. How much metal was used to make the holder? 12Pi cm2 12Pi cm3 16Pi cm2 27Pi cm2
Answer:
27Pi cm2
Step-by-step explanation:
took the test
27π square centimeters(Volume) of metal was used to make the holder.
What is the volume of a cylinder?The amount of space within a cylinder is its volume. You can find it by dividing the base area by the height.
Given that, a candle holder of metal whose radius is 3 cm and height is also 3 cm. Since the given object is a cylinder. Hence,
volume of candle holder = Area of base * height
the volume of candle holder = π 3² * 3 = 27π
Therefore, the metal used in the candle holder is 27π square centimeters (Volume).
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In order to answer the following question, please use the following image down below:
Find the value of x.
X=(Blank)
What is the value of X? Please show all the work on how you got your answer.
(If you can't explain your work, then it's fine. The only thing that I'm asking for is for you to show the work alongside your answer)
Answer:
30
Step-by-step explanation:
x(45) = 27(50) -->
45x = 1350 -->
x = 30
A cylindrical fish tank at the zoo has a capacity of 7252 cubic feet.
What is the height of the tank if its radius is 16 feet?
Use pi = 3. 14 and round to the nearest foot.
Answer: The height of the tank is 9.02 feet
Step-by-step explanation:
Hi, to answer this question we have to apply the next formula:
Volume of a cylinder = π radius² x height
Replacing with values given:
7252 = 3.14 ( 16 )² h
Solving for h (height)
7252 / 3.14(16)² =h
7252 /3.14 (256) =h
7252 / 803.84 = h
9.02 =h
The height of the tank is 9.02 feet
Feel free to ask for more if needed or if you did not understand something.
Answer:
9.02
Step-by-step explanation:
what is the sope of (5,9) and (4,11)
Answer:
The answer to your question is slope = -2
Step-by-step explanation:
Data
A = (5, 9)
B = (4, 11)
slope = m = ?
Slope means the steepness of a line.
Process
1.- Write the formula to calculate the slope
m = (y2 - y1) / (x2 - x1)
x1 = 5 y1 = 9 x2 = 4 y2 = 11
2.- Substitution
m = (11 - 9) / (4 - 5)
3.- Simplification
m = 2/-1
4.- Result
m = -2
AB is a diameter of a circle, center O. C is a point on the circumference of the circle, such that
CAB = 26°
What is the size of CBA?
A. 26
B. 45
C. 64
D. 74
Given:
AB is the diameter of a circle.
m∠CAB = 26°
To find:
The measure of m∠CBA.
Solution:
Angle formed in the diameter of a circle is always 90°.
⇒ m∠ACB = 90°
In triangle ACB,
Sum of the angles in the triangle = 180°
m∠CAB + m∠ACB + m∠CBA = 180°
26° + 90° + m∠CBA = 180°
116° + m∠CBA = 180°
Subtract 116° from both sides.
116° + m∠CBA - 116° = 180° - 116°
m∠CBA = 64°
The measure of m∠CBA is 64°.
The size of angle CBA is 128 degrees.
Explanation:To find the size of CBA, we can use the fact that angles in a triangle add up to 180 degrees. Since AB is a diameter, it divides the circle into two semicircles, and angle CAB is an inscribed angle that is half the measure of the central angle.
Therefore, m(CAB) = 26 degrees, and m(CBO) = 2 * 26 = 52 degrees. Since angle CBA is an exterior angle of triangle CBO, it is equal to the sum of the remote interior angles, which is 180 - 52 = 128 degrees.
So, the size of CBA is 128 degrees. The answer is option D. 74.
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What is the product?
negative 9 x (5 minus 2x)
a) 18 x squared minus 45 x
b) negative 18 x squared minus 45 x
c )negative 18 x minus 45 x
d) 18 x minus 45 x
Answer:
option A is the correct one
Step-by-step explanation:
The product of the expression negative 9 x (5 minus 2x) is 18x² - 45x.
The correct option is c) negative 18 x minus 45 x.
What is an expression?One mathematical expression makes up a term. It might be a single variable (a letter), a single number (positive or negative), or a number of variables multiplied but never added or subtracted. Variables in certain words have a number in front of them. A coefficient is the number used before a phrase.
Given expression:
Negative 9 x (5 minus 2x).
To find the product:
First, we simplify the expression,
-9x (5 - 2x)
Solving the parenthesis,
-9 (5 - 2x)
= -45x + 18x².
= 18x² - 45x.
= 18 x squared minus 45 x
Therefore, 18x² - 45x is the required expression.
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Solve the system of equations y=x^2-3x+2
y=-9x-3
To solve the system of equations y=x^2-3x+2 and y=-9x-3, set them equal and solve the resulting quadratic equation using the quadratic formula to obtain the solutions for x; then substitute back to find y.
Explanation:To solve the system of equations given by y = x2 - 3x + 2 and y = -9x - 3, we must find the values of x and y that satisfy both equations simultaneously. Since both expressions are equal to y, we can set them equal to each other to find the x-values that satisfy both equations:
x2 - 3x + 2 = -9x - 3
Rearrange the equation by adding 9x and 3 to both sides:
x2 + 6x - 1 = 0
This is a quadratic equation, which we can solve by factoring, completing the square, or using the quadratic formula. In this case, factoring is not straightforward, so we may opt for the quadratic formula:
x = (-b ± √(b2 - 4ac)) / (2a)
Here, a = 1, b = 6, and c = -1. Plugging these into the quadratic formula gives us:
x = (-6 ± √(36 + 4)) / 2
x = (-6 ± √(40)) / 2
x = (-6 ± 2√(10)) / 2
x = -3 ± √(10)
So the solutions for x are x = -3 + √(10) and x = -3 - √(10). To find the corresponding y-values, substitute these x-values back into either of the original equations.
The solution to the system of equations is:
(x, y) = (-1, 6) and (-5, 42)
To solve the system of equations:
1. Substitute the expression for y from the second equation into the first equation. This gives us:
x^2 - 3x + 2 = -9x - 3
2. Rearrange the equation to bring all terms to one side, setting the equation equal to zero:
x^2 - 3x + 9x + 2 + 3 = 0
x^2 + 6x + 5 = 0
3. Factor the quadratic equation:
(x + 1)(x + 5) = 0
4. Apply the zero product property to find the values of x that satisfy the equation:
x + 1 = 0 or x + 5 = 0
x = -1 or x = -5
5. Substitute these values of x back into either equation to find the corresponding values of y. Let's use the second equation:
For x = -1:
y = -9(-1) - 3 = 9 - 3 = 6
For x = -5:
y = -9(-5) - 3 = 45 - 3 = 42
Therefore, the solution to the system of equations is:
(x, y) = (-1, 6) and (-5, 42)